—Did you find the missing couple in the mountain yesterday?
—No, but we __________ to get in touch with them ever since.
| A．have tried | B．have been trying | C．had tried | D．had been trying |
—I’m terribly sorry to have given you so much trouble.
— ______
| A．Don’t mention it! | B．How come? |
| C．That’s all right. | D．So what? |
You may ______ it that Jennifer will come and help us if we are in trouble.
| A．rely on | B．carry on | C．base on | D．take on |
How long do you think it was ______ he got home in such bad weather?
| A．when | B．since | C．that | D．before |
—We are worried about Tom. Why hasn’t he come back?
—Don’t worry. He ______ in a traffic jam.
| A．might be caught | B．may have been caught |
| C．can have been caught | D．should have been caught |
He is busy preparing a secret present for his Mum, ______ is cheap but special.
| A．one what | B．what | C．one that | D．that |