The students in our school are encouraged to involve themselves in group activities，whether in or after class，______ they can develop their team spirit.
| A．when | B．which | C．that | D．where |
Do you have any idea ______ is actually going on in the classroom?
| A．that | B．what | C．as | D．which |
Only after they had discussed the matter for several hours ______a decision.
| A．they reached | B．did they reach | C．they reach | D．do they reach |
A recent survey ______that the majority of people are worried about the present high price of apartments in cities.
| A．indicates | B．includes | C．imagines | D．improves |
I ______along the street looking for a place to park when the accident______ .
| A．went; was occurring | B．went; occurred |
| C．was going; occurred | D．was going; had occurred |
AIDS is said ______the biggest health challenge to both men and women in that area over the past few years.
| A．that it is | B．to be | C．that it has been | D．to have been |