(2012全国新课程)I use a clock to wake me up because at six o'clock each morning the train comes by my house.
If he __________, he would have passed the examination.
When we travel in other countries, we have to ________ lots of different customs.
Great changes ___ in the past ten years in China.
Many accidents _________ by careless drivers last year .
The book ___ to me is very interesting.