______ of the area _______ covered by trees.
A. Two-third; is B. Two thirds; is C. Two-third; are
---Who’s that at the door, Tony?
---________ is the postman, I think.
| A．He | B．It | C．This | D．That |
The plan they are talking about _________ improving greatly.
| A．need | B．needs |
| C．needing | D．needed |
---Alice, the dress __________ silk looks good ___________ you.
---Thank you.
| A．is made of; on | B．made of; in |
| C．made of; on | D．is made of; in |
—The teachers in that school speak either English or French, or even_______ ?
—That’s so cool.
| A．both | B．all | C．neither | D．none |
— Must I turn off the gas after cooking?
— Of course. You can never be________ careful with that.
| A．enough | B．too | C．so | D．very |