The "balance of nature" is not an empty phrase. Nature provides a population to occupy a suitable environment and cuts down surplus population to fit the available food supply. One means of reducing surplus population is predators(食肉动物) ; o

A. But that B. Despite C. But for D. In spite of

A. to B. on C. for D. onto

A. join B. attract C. stick D. transfer

A. their B. whose C. of them D. with whom

A. put out B. put on C. put off D. put up

A. finds B. found C. founds D. founded

A. waited B. was waiting C. has waited. D. had been waiting .

A. to get B. shall get C. will get D. will have gotten .

A. come B. are coming C. came D. have come

A. gave B. to give C. giving D. would give