.They ___ out because the light’s on. Let’s go upstairs and have a look.
33. The users of this new mobile phone can check e-mails _____ they happen to be.
32. We trust you; only you can ______ him to give up smoking.
31. My computer ______yesterday .I must get it repaired this afternoon.
30. It is a good city for cycling because it is flat and ________is convenient for bikes.
29. That prices are going up so rapidly these day,_______really makes many people worried