--This kind of sports is exciting．
--Yes，but it's dangerous．One can't do it ____ he or she has got some training．
| A．if | B．after | C．when | D．Unless |
--Could you tell me ____?
--Until tomorrow afternoon．
| A．how long you will stay there |
| B．how soon you will stay there |
| C．when will you stay there |
| D．how often will you stay there |
--How can we help the children in the mountain village?
--We can ____ leaflets to ask people to donate money．
| A．give in | B．give off |
| C．give up | D．give out |
Chairperson Xi calls on us to do what we can ____ as much as possible．
| A．save | B．to save | C．saved | D．saving |
--Mr. White asked me to remind you of the meeting this afternoon．Don't forget it!
--OK，I ____．
| A．won't | B．don't | C．will | D．do |