He waited with his companion_________the rescuers came, and then helped them carry her back down the mountain.
A.when | B.until | C.unless | D.while |
Mr. and Mrs Scott prefer a trip in a small town to in so large a city as New York.
A.this | B.one | C.it | D.that |
一Is there any possible way to help them get rid of such a bad habit?
一To tell the truth, it’s very hard.But we on this problem.
A.worked | B.had worked | C.are working | D.had been working |
When it air pollution, Beijing faces the three “C” s,cars,coal and construction,which lead to Beijing's thick air pollution.
A.refers to | B.comes to | C.happens to | D.speaks to |
Once education is made free,many children who have dropped out of school .
A.will come back | B.came back | C.have come back | D.had come back |
When I lived with my roommates in the university, we often talk into the night
A.might | B.could | C.should | D.would |