--Have you seen Jack? His mother is looking for him all the afternoon.--No, I haven’t. I am sure his mother________be very worried.
We _______ two hours in doing our homework every night.
They tell us some ways _________English well.
We can’t do well in examination _________ we study hard in school time.
We still couldn’t decide _________ with our difficulties in learning English.
He speaks too quickly_________.