As students, we should work hard and do ________ best to realize our dreams. 

There is ___ food in the fridge(冰箱). Let’s buy some.

How is your father? Please say hello to ______ for me.

Tom and Mike are good friends. _____ often help each others.

—I’m too busy. Could you do_______ to help me?—Of course. I can do_______ for you if you want me to.