In order not to be disturbed ,I spent three days __________ in my study.
| A．locking | B．locked | C．to lock | D．lock |
—Have you heard about the recent election?
—Sure, it _______ the only thing on the news for the last three days.
| A．would be | B．is | C．has been | D．will be |
At the routine office meeting, the headmaster insisted that the problems _______ paid special attention to.
| A．referred to being | B．referred to be | C．refer to being | D．refer to be |
_______ basic first-aid techniques will help you respond quickly to emergencies.
| A．Known | B．Having known | C．Knowing | D．Being known |
People develop _______ preference for a particular style of learning at _______ early age and these preferences affect learning.
| A．a; an | B．a; 不填 | C．不填; the | D．the; an |
—Is the chemistry experiment easy? —______. I’ll just do my best.
| A．I think so | B．Certainly | C．Not a little | D．Anything but |