. What caused the accident ______ on the road.
| A．were stone | B．were stones | C．was stone | D．was stones |
He ________ be more than thirty------ he looks so young, just like a teenager!
| A．can’t | B．mustn’t | C．shouldn’t | D．may not |
_________ I traveled by boat, I got seasick.
| A．After | B．Each time | C．The every time | D．Each time when |
What a good idea it is that Sarah and Dave are supposed to ______________ as movie characters for the party.
| A．give up | B．call up | C．dress up | D．build up |
Such a good opportunity may not come again, so you ____________ let it go this time.
| A．hadn’t better | B．wouldn’t better | C．would better not | D．had better not |
The world is changing rapidly and sometimes we find it almost impossible to ________ the advances in science and technology.
| A．keep up with | B．come up with | C．put up with | D．stay in touch with |