To keep the air fresh during the night, I often sleep with the windows on ________ it’s really cold.
| A．unless | B．if | C．because | D．when |
I think this is ___ useful book, so I will keep it for ever.
| A．a | B．an | C．/ | D．the |
Peter is a _______boy. His younger brother is _______.
| A．ten-years-old ; six years old | B．ten years old ; six years old |
| C．ten years old: .six-years-old | D．ten-year-old ; six years old |
—The supermarket is crowded（拥挤的）. There are _______ people there.
—Yeah, and the things there are always __________ expensive（贵的）.
| A．too much; much too | B．much too; to many |
| C．too many; much too | D．many too; too much |
We all like ________animal. Because they are ______ interesting.
| A．kind of; kind of | B．this kind of; kind of |
| C．kind of; kind of | D．this kind of; this kind of |
Could you tell me if Bob__________ the party? If he __________ , please tell me .
| A．joins ; joins | B．will join ; will join | C．will join ; joins | D．joins; will join |