Fill in the blanks to complete the conversation.
A. Wear your safety masks and goggles first.
B. What seems to be the problem?
C. Before you leave, clean up your workstations.
D. I'll try to sharpen the pictures.
Student: Teacher, the pictures are too blurry.
Teacher: (1) Can you see them clearly now?
Student: Yes, teacher.
(5 minutes later)
Teacher: Those are the steps for our experiment today.
Student: Teacher, can we start now?
Teacher: Not yet. (2) Then you can start.
(5 minutes later)
Teacher: (3)
Student: My solution doesn't form bubbles.
Teacher: You need to boil the solution for 5 minutes. Be patient.
Student: I got it. Thank you, teacher.
(At the end of the experiment)
Teacher: That's all for today. (4) And wash the test tubes carefully.
DBAC
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