13. His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard
| A．what; that | B．which; whether | C．what; whether | D．that; that |
We’d be very grateful if you could join us because your cooperation will _____ the timely completion of our project.
| A．reach for | B．make for | C．go for | D．stand for |
My mobile phone disappeared. Where _____ I have left it?
| A．may | B．must | C．could | D．should |
My brother is always on medicine, so he has ___ table tennis to keep fit.
| A．taken up | B．built up | C．made up | D．held up |
______the news, so far, has been good, there may be bad days ahead.
| A．when | B．while | C．If | D．Since |
______ in March, that so many people had on their light wears.
| A．So hot became the weather | B．So became the hot weather |
| C．The hot weather became so | D．So hot did the weather become |