. According to some doctors, one of the ways to prevent us from growing old is to make sure that our brains get enough___.
His sunburnt face is just like that of millions of Chinese farmers, whom he has struggled the past five decades.
All of the students were by the speech given by the headmaster.
Jane’s way of studying chimps, our group are all going to visit them in the forest.
being fun, swimming is a very useful skill.
Mr. Li devoted all his life English. Now he retired.