---Hi, Tina. Could you help me cut up the meat for dumplings? ---Sure, Mom. But where is the _______?
Everyone in the class studied very hard since no one wanted to _____. A. fall down B fall off C. fall behind D. fall out
No matter how hard it is, just go on and never ____.
While you are doing math exercise, put a calculator(计算器) ____ to help you.
Here you are! This is one of the keys ____ the lock.
I can’t ______ Tom. He is a real idiot(白痴).