I am one of the students who _________ English well in my class but he is the only one of us __________ maths well.
It was nine years ago, ________ I went to the UK for the first time, ________ I began to learn English.
That old man ________to be more than a hundred years old, but he looked much younger than most of the ninety-year-olds.
Something must be done to stop cutting down trees. ________ all the trees are cut down, the valuable soil will be washed away by the heavy rain.
Mr. Black, as far as I know, is said _______ a book on the history of the Ming Dynasty, which turns out to be a bestseller.
The contributions of some companies have ________ much improvement in the teaching and learning environment in this university.