Now most families have only one child _____ our country’s one-child policy.
There are cars in the street. It’s crowded.
My father usually drives to work ______ taking the bus.
---Do you know if Jim______ to play basketball with us?---I think he will come if he ______ free tomorrow.
The art club is for members only. You can’t go in _____ you are a member.
Our teacher asks us to remember that _______ careful we are, _______ mistakes we will make.