1: her son has to be looked after carefully

2:these exercises has to be finished by Thuy tonight

3:a bridge is going to be built over this river

4:: the party will have to be delayed

5:what will be planted in their garden?

6:where should this picture be put?

1.A lot of plays has been written by my brother

2. His second tragedy has been finished

3.My homework haven't been done.

4.The moon has been seen by you

5.That book has been read by him when he was a boy

6.The thief has been caught by the police

7.This film has been seen by her a several times

8.

1. was watching

2.was looking

3.thought

4.ran

5. slept

6.swichted/heard/decided/was reading

I____was watching______(watch) TV when my wife called me.

When she ___looked________(look) up, i realized that she was crying.

I immediately____thought_____(think) that something terrible had happend.

Actually, a mouse ___ran______(run) in the kitchen.

I_____opened______(open) the door and it left.

It was late and my son ___slept_______(sleep).

I____switched___(switch) off the light in his bedroom, but he ____heard______(hear) me and he woke up.

So, i ____was deciding____(decide) to read a story but while i ____was reading______(read), i realized that he had fallen asleep again.

* Làm khác bạn kia vài câu :>

Bài làm:

Ta có: \(\frac{a}{b}=\frac{b}{c}\) => \(b^2=ac\)

Thay vào ta được: \(\frac{a^2+b^2}{b^2+c^2}=\frac{a^2+ac}{ac+c^2}=\frac{a\left(a+c\right)}{c\left(a+c\right)}=\frac{a}{c}\)

Vậy \(\frac{a}{c}=\frac{a^2+b^2}{b^2+c^2}\)

Đặt \(\frac{a}{b}=\frac{b}{c}=k\Rightarrow\hept{\begin{cases}a=kb\\b=kc\end{cases}}\Rightarrow a=k^2c\)

\(\frac{a^2+b^2}{b^2+c^2}=\frac{\left(k^2c\right)^2+\left(kc\right)^2}{\left(kb\right)^2+c^2}=\frac{k^4b^c+k^2c^2}{k^2b^2+c^2}=\frac{k^2\left(k^2b^2+c^2\right)}{k^2b^2+c^2}=k^2=\frac{a}{c}\)( đpcm )

1. allergy

2. don't wake me up

3. gets deeper

4. get sick

5. stay healthy

6. say no

7. junk food

8. wake me up

9. signature

10. sick

11. accept

12. to

13. be allergic 

14. on weight

15. the flu

=> The last time they watched  that film was in 1989

The last time they didn't watched that film was in 1989

=> i haven't talked to her for last month

I have talked to her since last month

-> The last time she cook was two day ago

The last time she didn't cooked was 2 days ago

pleased

My teacher was very pleased that I studied hard. 

 I think listening to music is my hobby. I love listening to all kind of music when I do my housework, when I do not have anything to do, or even when I have meal. I love all kinds of music; country, pop, rock and roll, and other kind of music. I am interested in hearing them because all songs bring me back my lovely memories. And they bring me energy to clean my sould. Most of the time, I love listening to music to relax my body. The music can make everything funier. Listening to some new songs is awesome. You can see the life is more beautiful.

My favourite hobby is reading. I enjoy reading a book when I am free. I started to do it when I was four years old. The first time I did it, I felt interested. So I kept reading. The teachers always taught me to read the difficult words. I was happy when I read a story with a happy ending. I was thrilled when I read a detective story. I enjoy reading because I to explore the imaginative world of my favourite author, J.K.Rowling who writes “ Harry Potter” . There are a lot of advantages of reading. Reading can make me relaxed and calm. I can also learn new vocabulary items. Then I can further improve my English. Moreover, it can give me an unlimited imagination, so I can write books in the future. I can learn the different cultures and customs of other countries in the world too. I read at least one hour every day. I read books by myself. I usually read it at home. I wish I could read different kinds of books because it might be very challenging.