You must tell me the answer ________ the question before they come. [ ]

I________astudentandMissLiu________myteacher.

If you want to speak English well, it’s ___ for you to practice as often as you can.

The man stood ____ the window, watching the boys playing outside. [ ]

Now more and more people have realized that drugs do great harm to people’s health and their families. — Quite true, so everyone should them.