初中英语状语从句单选题

I will send you an e-mail as soon as I ______ in Canada.

A．arrive

B．arrived

C．am arriving

D．will arrive

I’m waiting for my friend.     , I’ll go shopping alone.
A. If she comes     B. If she doesn’t come C. If she won’t come

Mr. Green speaks very loudly     all the people can hear him clearly.
A. so that          B. when              C. because