Be careful when you cross this busy street. If not, you may _____run over by a car. [ ]

Scientists say it may be fiveyears ______ it is possible to test this medicine on human patients．

So absorbed _____ in the experiment that he didn’teven notice it was already over 12 o’clock.

How do you improve your ________ —By reading aloud every morning.

The book didn’t ____ children probably because the author employed too many scientific terms in it.[ ]