54. It's very cold outside. You should put on more clothing to ______, otherwise you will catch bad cold.
| A．keep it out | B．make it out | C．keep out it | D．keep off it |
The change was so _____ that we hardly noticed it.
| A．actual | B．frequent | C．gradual | D．grateful |
English words are not always spelt_____________.
A the way which they soundB by the way they sound
C the way they soundD as they are sounded
The astronaut did many experiments in the spaceship,__________________much help for knowing space.
| A．which we think it is | B．which we think are of |
| C．of which we think is | D．I think which is of |
Once ____________ , a plan should be carried out.
| A．make | B．making | C．made | D．to make |
—"How do you like the book?"
— "It's quite different from I read last month."
| A．that | B．which | C．the one | D．the one what |