While she is a lovely girl, she be extremely difficult to work with.
| A．may | B．must | C．should | D．can |
27. The boy gathered all his _____ to stand up.
| A．strength | B．power | C．force | D．Energy |
26. We were all waiting for you. You _____ for the seaside by yourself without
leaving a message.
| A．mustn’t leave | B．shouldn’t have left | C．could not have left | D．needn’t leave |
25. When a person wants to operate the computer, _____ read instructions first.
| A．you will have to | B．one must | C．they will have to | D．he has to |
24. _____ many other scientists, Albert Einstein enjoyed music besides scientific
research work.
| A．In common | B．In the same | C．In common with | D．As |
23. He did as much as he _____ her.
| A．could help | B．could to help | C．helped | D．Helping |