Today we are going to talk about the effects of smog ______ the environment.
A.to B.towards C.on D.in
When I went into the room, I saw my foreign teacher ____ some students with their oral English.
A.helping B.to help C.help D.having helped
It was when I got back to my apartment ________ I first came across my new neighbors.
A.who B.where
C.which D.that
When walking down the street, I came across David, who I _____ for years.
A.didn’t see B.haven’t seen
C.hadn’t seen D.wouldn’t see
His casual remarks led to ______ by others.
A.me misunderstood B.my misunderstanding
C.my being misunderstood D.me be misunderstood
I wish to thank Professor Smith, without ________ help I would never have got this far.
A.who B.whose
C.whom D.which
