____ the police know the killer's identity, they are getting close to catching him.
| A．Even if | B．Although | C．Now that | D．As long as |
People working 10 or 11 hours a day are more likely to suffer from health problems than _____who go off duty after eight hours.
| A．those | B．that | C．these | D．them |
I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.
| A．whom | B．them | C．which | D．whose |
— Mum, would you please buy me an MP5 player?
— If you can help do some housework the whole vacation，you ____ have one as a reward.
| A．must | B．need | C．would | D．shall |
— Sorry, I can't return your book today because I am only half way through it.
—____ I have plenty of other book
s to read.
| A．Take it easy | B．No wonder | C．Take your time | D．No doubt |
Lorry, ___ university student from America, teaches us ___ history of western art.
| A．an; the | B．a; the | C．the; / | D．the; a |