There is a popular opinion among teachers _____ reviewing the lesson after class can help students learn better.
If you are in trouble , Mike is always willing to _______ a hand .
It was 300 hundred years ago _______ this historic temple was built by a wealthy Mandarin.
Being a Chinese, I feel proud of my country and the contributions _________have been made to the world culture.
_______ from father to son, the music has not changed for centuries.
---I decided to travel round Yunnan for a year. ---_______? You have just started a new job.