— Too much work and too little rest often illness.
— Yes. We must learn to take good care of ourselves.
| A．begin to | B．are friendly to |
| C．take action to | D．lead to |
In which of the following places can you often see this sign?
| A．In a park. | B．In a school |
| C．In a science museum. | D．In a street |
— We can use QQ to talk with each other online.
— Really? Could you please show me _______ it?
| A．what to do | B．how to do | C．when to do | D．why to do |
---Where would you like to go?
---I’d like to go ________.
| A．warm somewhere | B．place warm |
| C．somewhere warm | D．warm place |
I don’t like people ______ talk much but do little.
| A．who | B．that | C．which | D．whose |
The earth will become worse and worse ________ we do something to stop her from being polluted.
| A．if | B．even if | C．when | D．unless |