．You’d better get the problem solved as soon as possible _____

．You’d better get the problem solved as soon as possible ______ it becomes out of control．

#33130

when

before

since

unless

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.  Some people say more but do less ______ others do the opposite.

#33148

once

when

while

The police came in __________ the thief attempted to rush out of the store.

#33180

at the moment

the moment

for the moment

at any moment

Peter was so excited ______he received an invitation from his friend to visit Shanghai.

#34195

here

hat

hen

．When he goes out, he often wears sunglasses _______nobody can recognize him．

#33056

so that

now that

in case

as though

I have no idea ______ measures the government will take to stop the air from being further polluted.

#30177

which

what

that

whose