“The answer sheet written with a pencil be cancelled,” declared the teacher.
| A．shall | B．should | C．must | D．may |
. I'd really appreciate ________ if you would turn off the lights before you leave.
| A．you | B．that | C．as | D．it |
It never _____ humans until the mid1990s that some animals can be cloned.
| A．occur | B．is occurred | C．occurred to | D．occurred |
If you _____ his wife’s income____ his own，the total of their income _____ 3000 yuan.
| A．add; to; will add up to | B．add; to; adds to |
| C．add up; to; adds up to | D．will add; for; adds up |
Is it a wonder that ____little cells can store much energy?
| A．so; so | B．so; such | C．such; such | D．such; so |
As a senior high student, you should your energy on how to master the skills of learning.
| A．impress | B．spend | C．concentrate | D．use |