_______ the end of last spring Wang Hai joined the army _______ the end.
| A．At/at | B．By/in | C．In /at | D．At /in |
Ming Ming is ________ Chinese boy.
| A．a | B．an | C．the | D．/ |
This is ______ pencil box.
| A．my | B．I | C．mine | D．me |
Which of the following signs means “Save Water”?
A. 
B. 
C. 
__________ fine weather it is! I’d like to go fishing.
A. What an B. What C. How
—I saw Helen in the library this morning.
—No, it _________ her. She moved to France last week.
A. can’t be B. can be C. mustn’t be