Type the correct form of the word in parentheses to complete each
sentence.
1. The spacecraft is still ____________________ (send) messages back to Earth.
2. Halley’s Comet ____________________ (appear) every seventy-
ive years.
3. Space colonies ____________________ (become) common in the future.
4. Scientists used to ____________________ (think) Pluto was a planet, but they don’t anymore.
5. Galileo ____________________ (discover) the moons of Jupiter in 1610.
Type the correct form of the word in parentheses to complete each
sentence.
1. sent
2. appears
3. will become
4. think
5. discovered.
reappears cũng được mà phải hong