----Have you finished your homework?
-----No, I ________ my younger sister all day yesterday.
| A．was looking after | B．would look after |
| C．had looked after | D．look after |
― Have you finished your composition already, Jack?
― Yes. I _____ it within half an hour.
| A．have finished | B．finish | C．finished | D．will finish |
With the development of science, more new technologyto the field of IT.
| A．has introduced | B．is being introduced |
| C．is introduced | D．was introduced |
It looks like the weather is changing for ______. Shall we stick to our plan?
| A．the worse | B．worse | C．the worst | D．worst |
I wanted some paper but there was _____ in the house.
| A．nothing | B．none | C．no one | D．not one |
Many lifestyle patterns do such great harm to health that they actually speed up ______weakening of the human body.
| A．a; / | B．/; the | C．a; the | D．/; / |