Can I wear any clothes I like to school?—No, you can’t. You ___ wear a uniform.

I don’t know when my son ________ back. When he_________ back, I’ll call you.

I don’t know if he_______ tomorrow. If he _______, I will call you.

Mary isn’t my sister. _________ is my cousin.

Can you believe that in ____ a rich country there should be ___many people.