(2014·天津和平区一模)The medicine should usually be kept out of the________of children at home.

Ancient Greeks were responsible for many of the _______ in science and other fields．

If you are able to create a positive ______towards reading in your home ,your children will be more likely to seek out reading as a way to gain praise

To keep fit, you should take more______ . Don’t be always busy doing your ______.

If we keep wasting so much energy, _____are that our oil wells will dry up and the environment will be destroyed.