My bicycle is nowhere to be found. Who ___ have been using it?
| A．should | B．must | C．could | D．might |
Is this _____ ?
| A．you are looking for | B．that you are looking for |
| C．what are you looking for | D．what you are looking for |
He _____ himself in Shanghai.
| A．lost | B．missed | C．losing | D．missing |
The student all the teachers were proud was accepted by Beijing University last year.
A．in  whom |
B．of whom | C．on whom | D．for whom |
It is surprising that little boy should have much knowledge of science.
| A．so, so | B．such a, such | C．so a, such | D．such a, so |
She is a warm-hearted person she spends a lot of time on volunteer work.
A. in order that B. in order to D. so that D. why