It is reported that PM2.5 pollution is the main problem( )air pollution today.
Let's discuss the plan,shall we?Not now.I( )to an interview.A.go B.went C.an going D.was going
May I speak to Mr.Smith?( ),please.I'll see if he is in.A.Hold on B.Look out C.Keep up D.Come on
Alice,could you help me( )the map of the world?We don't need it any more.A.put out B.put on C.put away D.put up
Tom,haven't you forgotten anything?Oh,yes( )my umbrella.Thank you.A.Taking B.Took C.Take D.To take
我没有悬赏分了！等我有的话一定答谢！第一题是选介词，除OF外的