1. WHEN were you shown the laboratory of organic chemistry?
2. BY WHOM is the new sort of steel being tested?.
3. WHAT have the experiments shown to us?
4. HOW can the flame of the burner be regulated?.
5. WHAT did they heat by means of a Bunsen burner?
6. WHAT does the new lab consist OF?
7. WHAT is every working place fitted with?
8. WHERE must the analytical balance be kept?
9. WHAT will you see if you visit this laboratory?
10. WHEN had all the questions been answered?
11. WHAT does a barometer measure?
Объяснение:
1.I was writing a letter while she was reading a book. (WRITE, READ)
2.When I at them, they at me. (LOOK, SMILE)
looked, smiled
3.What (you) in the evening yesterday? (DO)
did you do
4.What (you) the whole evening yesterday? (DO)
were you doing
5.This time yesterday I at the theatre. (SIT)
was sitting
6.I to school when I him. (GO, SEE)
was going, saw
7.The train at 9.45. (START)
started
8.The boy with a knife when he his finger. (PLAY, CUT)
was playing, cut
9.He a report when I the classroom. (MAKE, LEAVE)
was making, left
10.This time yesterday we dinner. (HAVE)
were having
