(2011·四川)As is reported，it is 100 years _______

(2011·四川)As is reported，it is 100 years ________ Qinghua University was founded.

#30451

when

before

after

since

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He was in great trouble, but he acted _______ nothing had happened.

#33313

even if

as if

unless

until

______ you understand the rule, you can do it well.

#79900

For

Once

While

Many people say they love birds, but some plant trees _________ some make cages.

#34093

until

though

unless

while

________there is no law stating how you may dress，not all fashions are respectable.

#30225

Because

Since

While

Unless

_____ there was no conclusive evidence, most people thought he was guilty.

#30206

Since

While

When

However

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