If you meet trouble, you can ______ your friends ________ help.
I am so tired today. I swam _____ the river in the morning and I walked ____ the forest in the afternoon.
He is businesslike and is often _______. I hope he will have more _______ at his business.
We must the teacher says in class.
You used to be a top student. You shouldn’t ___________.
_________ it is to go camping in ___________ weather!