The difference in achievement between the pupils are partly ________by their differences in age.  

I believe a leaf of grass is    than a star in the sky．Every plant gives us pleasure in its own way．

You should be ___________ confronting your roommates over any problems, especially if you have just met. Remember, be polite but firm.

It’s already 10’clock. I wonder how it ____ that she was two hours late on such a short trip.

We had a really bad time about six months ago but now things are ____.

We would explain the things       the children’s understanding in a simple way.

While we are busy living our dreams, our children are busy growing up, the people we love are moving away and dying, our bodies are getting _________, and our dreams are slipping away.

As a job seeker, he should first decide what _______ and what he should have _________ in his resume(履历).

In order to gain a bigger share in the international market, many state companies are starving _______ their products more competitive.