- Happy birthday!
- Thank you! It's the best present Ifor.
| A． | should have wished | B． | must have wished |
| C． | may have wished | D． | could have wished |
According to one theory, taking part in high-culture activities makes __________ easy for teenagers to make friends with powerful older people, __________ thus increases the chances of their lives turning out well.
| A．that, which | B．it, which |
| C．what, which | D．it, what |
There seems to be two causes as I try to figure out __________ that prevents so many children from being as happy as before.
| A．how it is | B．when it is |
| C．what it is | D．why it is |
We were struck by the limited use __________ their natural resources.
| A．those villagers made of |
| B．which those villagers made |
| C．for those villagers made of |
| D．for those villagers making of |
Cook was a strict but good captain, __________ usually took care of the sailors on his ship.
| A．the one who | B．one who |
| C．that | D．he who |
---How long do you think it will be __________ China sends a manned spaceship to the moon?
--- Perhaps two or three years.
| A．when | B．until |
| C．that | D．before |