---Could you tell us __________ ?
---About two weeks.
| A．how often are we going to be away |
| B．how often we are going to be away |
| C．how long are we going to be away |
| D．how long we are going to be away |
--- I wonder if your wife will go to the party.
--- If your wife does, so ____________.
| A．do I | B．will mine |
| C．does mine | D．will I |
Not only he but also I ______ able to solve this kind of problem.
| A．can | B．am | C．are | D．can be |
Tony’s sister is ______ to take care of the little baby.
| A．careful enough | B．enough careful |
| C．enough carefully | D．carefully enough |
—We’ll visit the Summer Palace_____ there is a heavy rain tomorrow.
— OK! Boating on the lake must be great fun.
| A．if | B．as soon as | C．unless | D．since |