We must do whatever we can to ______the river from being polluted any more.
| A．separate | B．keep | C．prevent | D．guard |
In this new city, we everyone will meet the when we don’t know what to do.
| A．occasion | B．statement | C．place | D．information |
— Are the two dresses of the same size and price?
— Yes. You may take , if you like.
| A．everyone | B．all | C．each | D．either |
When you go back home, please ring me up to let me know you safely.
| A．are arriving | B．had arrived |
| C．have arrived | D．will arrive |
Maybe you have travelled to many parts of the world, but nowhere else striking attractions.
| A．you can see so many | B．can you see such many |
| C．you can see such many | D．can you see many such |
—Thank you so much for changing the flat tire for me.
—Don’t mention it. I only did what anyone else in my place.
| A．must do | B．should do |
| C．may have done | D．would have done |