We ________ take clean drinking water for granted. One day we may run out of it.
| A．needn't | B．can't |
| C．won't | D．shouldn't |
-----________ he be watching TV now?
------Yes, he ________ be watching TV now.
| A．Must, can | B．Can ,must | C．Can, can | D．May, must |
．Have youconsideredthestudents’ request _________ the school library _______ more books on popular science?
| A．that; provide | B．when ; provided |
| C．which; should provide | D．where; would provide |
A person ______ e-mail account is full won’t be able to send or receive any e-mails.
| A．who | B．whom | C．whose | D．whoever |
．It is obvious to the students ______ they should get well prepared for their future.
| A．as | B．which | C．whether | D．that |
．I’m sorry you’ve been waiting so long， but it’ll still be some time ____ Brian gets back.
| A．before | B．since | C．till | D．after |