—May I go swimming this afternoon? — I'm afraid not ______

—May I go swimming this afternoon? — I'm afraid not _______ you have finished your homework.

#55374

unless

because

but

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He ran quickly all the way to school, ______ he was still late.

#57709

but

and

We can’t do well in examination _________ we study hard in school time.

#56352

and

since

unless

I hate travelling by air__________ you usually have to wait for hours before the plane takes off.

#56398

because

though

until

unless

As it reported, it is 100 years _____________ Tsinghua University was founded.

#56230

when

before

after

since

It’s dangerous______a tree．

#58020

climbing，

going up

to climb

clim

共1556题