________ we don’t hurry up, we ________ the early bus．

A．When; miss

B．If; will miss

C．If; will catch

D．When; have missed

We must be quick, ________ we will miss the early bus．

A．and

B．so

C．but

D．or

－Why are you late for school?

－________ I didn’t catch the early bus．

A．As

B．Since

C．Because

D．Because of

Hurry up ________ you can’t catch the early bus．

A．or

B．and

C．though

D．because