I cannot______ puzzled，for I simply cannot understand how I could have made such a stupid mistake.
| A．help feel | B．help but to feel | C．but to feel | D．but feel |
________knowledge a man has，________it is for him to get a good job.
| A．The more; more difficult | B．The more; the easier |
| C．The more; easier | D．The less; more difficult |
Many chemical substances react________oxygen.
| A．on | B．with | C．against | D．to |
The population of China ________ 1.3 billion，and 80% of the population________farmers.
| A．are; is | B．is; is | C．is; are | D．are; are |
They are quite different ________ each other ________their tastes.
| A．from；in | B．in; from | C．with; on | D．with; in |
He ________to come at eight, but in fact he never comes before nine.
| A．is supposing | B．supposes |
| C．is supposed | D．supposed |