---Turn off the TV, Jack, ______ your homework now?
--- Mum, just ten more minutes, please.
| A．should you be doing | B．shouldn’t you be doing |
| C．couldn’t you be doing | D．will you be doing |
It has been confirmed____________he wasn’t the person who stole your bike.
| A．if | B．whether | C．why | D．that |
. He is clever and has a____________for learning language.
| A．gift | B．mind | C．heart | D．skill |
The storm is moving slowly____________.
| A．eastern | B．to eastern | C．to eastwards | D．eastwards |
. He made up his mind to devote his life____________the river____________polluted.
| A．to prevent, to be | B．to prevent, from being |
| C．to preventing, to be | D．to preventing, from being |
. Many people think that it is ____________making such an experiment.
| A．worthwhile | B．worth | C．worthy | D．valuable |