_______ how to do the homework, I went to ask my teacher for help.
| A．Not to know | B．Not knowing | C．Knowing not | D．Not known |
I would love ___ to the concert last night, but I didn’t get the ticket for it.
| A．to go |
| B．going |
| C．to be gone |
| D．to have gone |
As soon as he got to the office, he ___ the students’ papers.
| A．got down to correct |
| B．got down to correcting |
| C．set down to correcting |
| D．sit down to correcting |
If you don’t pay ____ to the signs, you might have trouble finding my house.
| A．look |
| B．watch |
| C．attention |
| D．visit |
What he didn’t mean ____ you. He meant ____ you.
| A．hurting; helping |
| B．to hurt; helping |
| C．to hurt; to help |
| D．hurting; to help |
It is believed that ____ part of the animals cannot stay alive in water at 1,500 meters below ___ sea level.
/; /
B a; a
C. the; the
D. ／; the