________ repeatedly, the problem still appeared in the beginners’ homework.
| A．Explaining | B．Having explained |
| C．Having been explained | D．To be explained |
She is so optimistic that her cheerful spirits and bubbling laughter _____ the whole class.
| A．effect | B．effected | C．infected | D．infect |
After seeing such a sad movie, she felt _____ all the evening.
| A．depressed | B．depression | C．depressing | D．depressant |
The roads into London were so _____ traffic that even the fire engines couldn’t get through.
| A．choked up by | B．choked up with |
| C．choked back by | D．choked back with |
He is too pessimistic! I can’t _____ his pessimistic view of the state of the economy.
| A．subscribe to | B．subscribe with |
| C．disagree to | D．disagree with |
What _____ of the babies die of disease every year? asked Zhang Min’s father in a hurry.
| A．percent | B．percents | C．percentage | D．percentages |