It’s said that there __________ an English report tomorrow afternoon.

It took them about ten days to go _____ the big desert (沙漠).[ ]

The environment is becoming worse and worse. I think we should do something to ____ people ____ cutting the trees in order to protect the earth.

. –Mary, is this ______ umbrella?–No, it’s not mine. It is _______.

Why are you standing there, Maggie?-I can’t see the blackboard clearly. Two tall boys are sitting __________me.[ ]