It will take _____ years to make robots _____ the most unpleasant things .
---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.