A.had begun B.has begun C.is begun
单项选择题You()to lock the door at night.
A.shall B.ought C.must
单项选择题Silk()by Chinese for thousands of years now.
A.has been used B.was used C.is used
单项选择题he patient acted on the doctor's ()and finallyrecovered.
A.advices B.advise C.advice
单项选择题Let me()the case carefully before I draw a conclusion.
A.look out B.look into C.look after
单项选择题More and more people in China now()to work regularly.
A.drive B.drives C.have driven
单项选择题The sun heats the earth,()is very important to living things.
A.that B.what C.which
单项选择题All the team members tried their best. We lost the game,()
A.as B.therefore C.however
单项选择题It is very convenient() here.
A.living B.to live C.live
单项选择题Ancient Greece is the()of western civilization.
A.sorces B.source C.origin
单项选择题I prefer classic music()pop music.
A.than B.to C.with