— Where is Tom?

— Well, he ______ you ______ here．Otherwise he would come down right now．

A．didn’t know; were　　 　　　　　　 B．hasn’t known; are

C．doesn’t know; are　　　 　　　　　 D．hadn’t known; were

My son has changed so much that I could hardly __________ his voice on the phone.

　 A. hear　　　　 B. realize　　 C. recognize　　　　 D. find

I don't understand why you ________ your mind constantly! We aren't able to decide where to spend our holiday.

A．change B．will change　 C．were changed　　 D．have changed

I saw no more than one copy left in the bookshop. Will you go and buy ______?

　 A. it　　　　　　 B. some　　　　　　 C. any　　　　　　 D. one

I found ________ to ________ with one’s friends if we parted and lived far away.

A. it difficult; keep in touch　 B. it hard; lose touch　

C. difficult; get in touch　　　 D. hard; be in touch

The children's mother was very c______ for their safety when they didn't come back from school at the usual time.

They have rich and beautiful forests _____ in the south of the country.

A. grown    B. growing     C. planted      D. planting