He wrote a long letter ___he explained what had happened in the accident.
| A．what | B．which | C．where | D．how |
It was the fourth time that Tom _____ in the maths exam.
| A．failed | B．had failed |
| C．have failed | D．has failed |
We are flying at _____ altitude of 6,000 meters and perhaps we will get there at _____ midnight.
| A．the; the | B．an; the | C．an; / | D．the; / |
---Tom, what a pity. I almost succeeded yesterday.
---I told you to be careful before. ___________
| A．One false step will make a great difference. |
| B．Where there’s life, there’s hope. |
| C．Never put off till tomorrow what you can do today. |
| D．One tree does not make a forest. |
The young member made several proposals, none of __________ considered practical or acceptable.
| A．them | B．which | C．it | D．what |
—Well, did you miss the early train?
—Yes, but had I hurried, I _______.
| A．shouldn’t | B．hadn’t have |
| C．wouldn’t | D．wouldn’t have |