The silence of the library is sometimes broken by a sudden cough or the sound of pages __________.
| A．turning | B．turned | C．being turned | D．having turned |
One thousand dollars a month is not a fortune but would help cover my living.
| A．bills | B．expenses | C．prices | D．charges |
—Mary broke up with me!
—You_ _have forgotten about the Valentine's Day．
| A．shouldn't | B．couldn't | C．needn't | D．mustn't |
Have you considered how weak humans area volcano, hurricane or earthquake?
| A．comparing with | B．to compare with |
| C．compared with | D．having been compared with |
Can you explain ________ the sun goes down in the west?
| A．why is it that | B．why it is that | C．how it is that | D．how is it that |
—Someone has tidied the sitting room!
—Jim __ it this morning; he couldn't bear the mess any more．
| A．has done | B．would do | C．had done | D．did |