—Can you play ________ guitar?—Sure. It’s a piece of cake for me.
---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.
My aunt said that she ________ to Guangzhou.
Lucy was afraid ______ out at night, because she was afraid ______ the cats.