________ you are responsible for the information, you must be very careful.
| A．Unless | B．While | C．Since | D．Though |
－Why didn’t Tom give you one of his paintings?
－I didn’t want one，but he would have given me one if I______.
| A．did | B．would | C．will | D．had |
_________, the weather in America is different from place to place.
| A．As China | B．Like in China | C．Like China | D．As in China |
It is rather difficult to make friends with her, but her friendship, _______, is truer than any other’s.
| A．while gaining | B．after gaining | C．when to gain | D．once gained |
– Who should be responsible for the accident?
– The boss, not the workers. They just carried out the order _____.
| A．as told | B．as are told | C．as telling | D．as they told |
-----Have you got any particular plans for the coming holiday?
----- Yes, _______, I’m going to visit some homes for the old in the city.
| A．If ever | B．If busy | C．If anything | D．If possible |