—Did you call on any of your old friends when you returned to your hometown?—_______ of them. They were all very busy.

Mr Brown has three children, one of whom is a child of six,       twins of twelve.

— Do you often talk with your friends on the telephone or mobile phone?  — __________ . I like using QQ. 

Most of the roads were covered with thick snow, ____ made our journey more difficult.

I don't like to travel to big cities because it seems to me that one city is very much like___ ．