The teacher tells us not ______a hat in class. A. wear B. wearing C. to wear
There is a big and beautiful lake ______ the foot of the hill.
We go _____ duty at 8 a.m.
Li and I arrived ______ Heishan country safe and sound, all is well. Don’t be worry.
The kids are doing some experiment ______ the farm in the country.
We are listening the weather report _____ the radio.