I have waited for the bus for twenty minutes.(对画线部分提问)________ ________ have you waited for the bus?
It is dangerous for teenagers to give out too muchabout themselves on the Internet.
—Is John coming by train? —He should, but henot. He likes driving his car, but I’m not quite sure.
—Mum, can I go shopping with Gina? —Well, If I were you, Ihomework first.
We should obey the traffic rules in order to keep ourselves .
The 3-month-old baby cried from time to time last night. His parentshad a good sleep.