15. _______ the day went on, the weather got worse, which made it impossible for them
to go down the mountain.
| A．With | B．Since | C．While | D．As |
They have rich and beautiful forests _____ in the south of the country.
| A．grown | B．growing | C．planted | D．planting |
People at weekends go walking and _______ in the country, ________”bush”.
| A．camping; called | B．camp; called |
| C．to camp; calling | D．camping; calling |
– How soon could they cover the distance?
--- ____________.
| A．For two hours | B．During the two hours |
| C．After two hours | D．In two hours |
– Sir, we have failed to work out this problem. What is exactly the right way?
--- Look. Only in this way ________ , but you boys _____ a wrong way.
| A．you can work it out; take | B．you can work out it; take |
| C．can you work it out; take | D．can you work it out; took |
Not until he got to the factory _______that he had lost his papers.
| A．he found | B．did he find | C．had he found | D．has he found |