Don’t turn off the computer before closing all programs，________ you could have problems.                                                          (2013·北京，22)

Let’s go to give the stranger a hand.________he’s got into some trouble.

—Could you ________ take care of my cat while I’m away?
—Sure.Leave it to me，please.

Sam ________ some knowledge of the computer just by watching others working on it.

The new movie ________ to be one of the biggest money­makers of all time.

By playing with the native boys and girls，one can ________ a lot of their language.

Teaching pronunciation class to a mixed group of learners can ________ a teacher with many challenging problems.

I believe his design is ______for it’s completely different from others’.

You are supposed to collect the mistakes you have made. You will make the same mistakes ______.

—Can I help you with it?.
—I appreciate your _____, but I can manage it myself.