You promised your friend a letter; you ought to ______ days ago.
| A．write | B．be writing | C．have written | D．be written |
There is a high probability _________ you will find aspirin and penicillin in any medicine cupboard in the world.
| A．that | B．which | C．what | D．where |
I don’t care whatever difficulty I will have _________ this survey.
| A．conduct | B．to conduct | C．conducted | D．conducting |
---What do you think of the movie?
---Wonderful. It couldn’t be ________.
| A．so good | B．the best | C．any better | D．worse |
The conference has been held to discuss the effects of tourism _________ the wildlife in this area.
| A．in | B．on | C．at | D．with |
It ______ be better if I could earn enough money to buy a private car.
| A．will | B．must | C．shall | D．would |