33.--Whose T-shirt is this?
--It ___ be Jim’s.It doesn’t fit him.
A.mustn’t B.needn’t C.must D.can’t
31.--Look! Here comes the bus!
--Well.let’s _____.
A.get on it B.get it on C.get it off D.get off it
30.____ they tried their best,______ they failed at last.
A.Though,but B.Though,/ C./,/ D.But,though