How can you expect him to make any progress________you never give him a chance to have a try?
| A．when | B．unless | C．even though | D．until |
This machine is very easy ______. Anyone can learn to use it in a few minutes.
| A．operating | B．to be operating | C．operated | D．to operate |
Every minute must be made full use _______ in class.
| A．of studying | B．to study | C．to studying | D．of to study |
While these activities might cause laughter ______ respect, in reality they require an enormous amount of strength.
| A．more than | B．rather than | C．other than | D．less than |
You can imagine what great trouble we had ______ the new school.
| A．setting up | B．to set up | C．set up | D．to setting up |
The Chinese government has passed a new regulation forbidding supermarkets and stores to ______ free plastic bags to shoppers in order to protect the environment.
| A．give off | B．give in | C．give up | D．give out |