1.They hurried there only to find the meeting cancelled. In fact, they ___ at all.
A.needn't have goneB.must have gone
C.can't have gone
D.might have gone
2.You can arrive in Beijing earlier for the meeting ___ you don't mind taking the night train.
A.providedB.unless
C.though
D.until
3.Staying in a hotel costs ___ renting a room.
A.as twice much asB.twice as much as
C.as much twice as
D.as much twice
4.What blood vessel is to a man's body, ___ railway is to transportation.
A.thatB.so
C.as
D.it
5.Evidence comes up ___ specific speech sounds are recognized by babies as young as 6 months old.
A.whatB.which
C.that
D.whose