To save class time, our teachers has _____ students do half of the exercise in class and complete the other half for our homework.
| A．us | B．we | C．our | D．ours |
.He has got himself into a dangerous situation ____ he is likely to lose control over the plane.
| A．where | B．which | C．while | D．why |
The passenger was very impolite to the conductor, ____ , of course , made things even worse.
| A．who | B．whom | C．which | D．what |
_____ was known to all , Willian had broken his promise ______ he would give us a rise.
| A．As; which | B．As; that | C．It; that | D．It ; which |
John knocked at the door for nearly five minutes____his wife opened it.
| A．when | B．before | C．until | D．as |
---The thread of my kite broke and it flew away.
---I told you it would easily break_____was the weakest.
| A．where | B．the place where | C．for it | D．where it |