The sentence needs _______.
| A．improve | B．a improvement | C．improving | D．improved |
---- Someone might see us.
-----___________? We are not doing anything illegal.
| A．What’s up | B．What if | C．How come | D．So what |
It’s already 10:00. I wonder how it that she was two hours late on such a short trip.
| A．came over | B．came out | C．came about | D．came up |
might be expected, the answer to the question was very mixed.
| A．As | B．That | C．It | D．What |
If their oxygen , the two British men a chance of surviving.
| A．ran out, had | B．didn’t run out, would have |
| C．had run out, didn’t have | D．hadn’t run out, would have had |
By the middle of the 1920s the farthest corners of the earth explored.
| A．are | B．were | C．have been | D．had been |