—Did you listen to Mr.Jackson’s lecture ?
— Yes，I have never heard a _____ one.

We should do what we can to save those_________ species, for example, the tiger, an animal which was considered_______ to humans.

Who is ______ to be the best football player this year still depends

If the teachers want to buy _____, it will take the university much money.

I searched the website. Unfortunately, the movie that I had seen many times was no longer _____.

—How much is _______ for a schoolbag?
—Experts say students should carry_______ more than 10 or 15 percent of their body weight.

Mr. Smith is driving a     car in the competition and I’m sure he will take the first place.

Tom has no       sense of life so he often makes stupid mistakes, making others laugh．

Just like fingerprints, each person’s DNA is ________unless he has a twin.

The situation is _________—we have no food, very little water and no medical supplies.