—Well, you've come back! ________ did you stay in Shanghai?
— For about seven days. I really enjoyed myself.
| A．How many | B．How far | C．How long | D．How often |
I have tried so hard but _____ I get nothing.
| A．in the end | B．at the end of | C．at the end | D．in the end of |
This famous drawing is sold ____ 10,000,000 dollars.
| A．in | B．by | C．with | D．at |
I can hardly work out the answer _____ this difficult question.
| A．of | B．to | C．in | D．for |
I got a letter this afternoon. It was ____ my foreign friend.
| A．from | B．in | C．in | D．at |
I’m all ____ sea and I’ve no idea how to fix my pencil box.
| A．in | B．on | C．at | D．off |