A. watchB. look upC. consultD. readI'm not quite sure h……

单项选择题Carbon dioxide（）from burning fuels is the most common of the so-called green-house gases.

A. producing
B. having been produced
C. to be produced
D. produced

单项选择题—Ring me at 5 am. No, better not so early ! I（）.—I got it.

A. will sleep
B. sleep
C. am sleeping
D. will be sleeping

单项选择题The old man who（）in the deserted house alone tbr ten years has been settled in a nursing home now.

A. lived
B. had lived
C. has lived
D. has been living

单项选择题Every camera we sell comes with a two-year（）

A. guarantee
B. safety
C. confirmation
D. conservation

单项选择题（）a moment and I will go to your rescue.

A. Go on
B. Hold on
C. Move to
D. Carry on