30．The novels written by the author sell best, but five years ago no one could have imagined how great a role he________in the literary world.
| A．was playing | B．played | C．was to play | D．had played |
As Susan stared at ______ piles of plastic in her recycling bin, ______ strong sense of responsibility made her stick to her recycling work．
| A．不填；不填 | B．不填; a | C．the ; a | D．the; the |
—Ring me at six tomorrow morning, will you?
—Why that early? I ______.
| A．will be sleeping | B．will sleep | C．have slept | D．have been sleeping |
-------Mary, the telephone is ringing!
---------______, but I am washing my hair.
| A．I’m sorry | B．You answer it | C．Hold on | D．That’s good |
-----Excuse me , but I want to use your bike?
------You ____have my bike if you don’t take care of it.
| A．shouldn’t | B．needn’t | C．shan’t | D．might not |
. Just hang the towel ______ the back of the chair so that it will dry soon．
| A．over | B．for | C．with | D．through |