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—Remember not to pretend to know what you don’t know.

— _____. My last lesson is still fresh.

Before use, your new mobile must fully____.

The science of computer,____ rapid progress has been made, is the most important of all.

I’m sorry I didn’t phone you, but I’ve been very busy_____ the past couple of weeks.

A red light will start continuously flashing when the batteries____ low.

Don't blame such a small boy any more. Even the wisest___ make a mistake sometimes.

More and more rich people have promised to ______ their wealth after death to help the poor and the disabled.

_______ his grades with Arnold’s, George was quite satisfied.

It is the prevention of disease_____ its successful treatment that has led to the rapid increase of the world’s population.

Steve Jobs’ death _______ quickly and soon became the talk of the whole world.