37. I tried all I could do ______ the topic at the meeting, but failed.
| A．avoid mentioning | B．to avoid mentioning |
| C．avoiding to mention | D．avoiding mentioning |
As senior 3 students, it is the most important to _______ a good state of mind in face of failure．
| A．keep up | B．keep on | C．keep out | D．keep off |
_____ three influenza type A virus subtypes（子类型） have been found in pigs．
| A．By far | B．As far as | C．So far | D．Till far |
Who would you rather ______ you repair your CD player?
| A．help | B．helped | C．helping | D．to help |
We decided to take a taxi．Luckily there was _____ waiting．
| A．some | B．another | C．any | D．one |
Ted has made up his mind to give it up, but on _____ second thoughts he determined to try______ third time．
| A．/ ; a | B．/ ; / | C．a ; a | D．the ; a |