Time to us all is limited. So in the days _______, we must work out a practical plan for our study and keep to it strictly.
Do you know when Mr. Brown _______? When he _______ , please let me know.
My uncle _____ to see me. He'll be here soon.
Look out! That tree _____ fall down.
Everyone likes to live in a house ______ windows face the south.
They talked about the persons and things ______ they remembered at school.