It is difficult for us to learn a lesson in life_________we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |
__________ a strange plant! I've never seen it before.
| A．Which | B．What |
| C．How | D．Whether |
Who do you think you'd like __________ with you, a boy or a girl?
| A．to have go | B．to have to go |
| C．to have gone | D．having to go |
— __________ Emily is in such a hurry?
—I don't know. She might run to catch the bus.
| A．Do you think why | B．Why you think |
| C．Why not think | D．Why do you think |
Attention, please. The plane to London __________ off at 9:00 pm.
| A．take | B．takes |
| C．took | D．has taken |
On AIDS Day, the minister of Health Department demanded that the problems __________ paid special attention to.
| A．referred to being | B．referred to be |
| C．refer to being | D．refer to be |