There are so many foggy days these days. We all wonder .A. how is the air polluted B. why the air is polluted seriouslyC. what are the real reasons
My uncle _______ his hometown for ten years. A. left B. has left C. has been away from
—It’s important ________ us _______ learn English well. —I agree with you. We should try our best to learn it. A. to, to B. to, for C. for, to
There are some students ________ in the English lesson. A. are sleeping B. sleeping C. to sleep
________ of the students in this class are girls. A. One five B. One fifth C. First five
.Mrs. Liu often ______ poor students ______ food and clothes. She is really kind-hearted. A. provides...with B. provides ... for C. gives ... for