Our college is going to choose some ______from the graduates to serve the poor village during the summer vacation

Tianjin is _______ Beijing. But it is _______ Shanghai.

My mother______when I got home.

Everyday the mother seems to be busy until 10o’clock at night,____the rest of the Family have fallen asleep.

Since drinking water is a limited resource, we ________ let children know how precious it is, and teachthem to conserve it.[ ]