________ people go abroad, they have to bring their passports with them.
A. Until B. When
C. Because D. Before
Never visit strange websites, ________ the thieves may crack(破译)the password of your Internet account.
A. or B. and
C. butD. so
________ exciting music the woman is playing!
A. How B. What
C. How anD. What an
Jerry ________ with a stranger when I met him on the way to work yesterday.
A. was arguing B. would argue
C. argued D. is arguing
Before you start this task, you ________ realize its importance of doing it.
A. may B. can
C. ought to D. would
To save water, the parents told their children ________ their teeth under a running tap.
A. to brush B. not brushing
C. not to brush D. brushing
