-- What’s one and two?-- _____ three.
Look! It ____ hard now. You’d better wait for a while until it stops.
You ____ swim in the river here. It’s dangerous.
--- ____ do you practice writing your compositions? --- Twice a week.
You can find many English novels from Mr Zhao’s QQ ____ download them.
The summer holiday will begin _____July 27th. A. at B. in C. on D for