With more and more birds _______, some day some species will _______ completely. In addition, some of them have _______ environmental pollution.
| A．dying off; die out; died from |
| B．dying away; die off; died from |
| C．dying down; die out ; died of |
| D．dying out; die away; died of |
Jenny hopes that Mr. Smith can suggest a good way to have her written English _____ in a short period.
| A．improve | B．improving | C．to improve | D．improved |
It is generally accepted that _____ boy must learn to stand up and fight like _____ man.
| A．a; a | B．a; the | C．the; the | D．a; 不填 |
I think nobody makes _______ contributions to the company than him.
| A．greater | B．more great | C．more greater | D．much great |
I have been living in the United States for twenty years, but seldom_______ so lonely as now.
| A．have I felt | B．I had felt | C．I have felt | D．had I felt |
Today’s teens don’t see anything strange in the fact _______the computer takes up a central place in their social lives.
| A．which | B．that | C．where | D．what |