1 . 我听到了好像焰火的声音。   I heard ________   ________   ________ fireworks.

2 . What advice        at the school meeting?

A．you suppose the headmaster will give

B．do you suppose that the headmaster will give

C．do you suppose the headmaster will give

D．do you suppose will the headmaster give

3 . —What did she want to know, Tom?
—She wondered      we could complete the experiment

A．when was it that	B．it was when that
C．it was when	D．when it was that

4 . Now all of our concentration is on ________ it is that the global environment will return to normal.

A．which

B．what

C．where

D．when