．Please make sure that this room is ____ when the visitors arrive.
| A．in use | B．in peace | C．in order | D．in place |
________ the market in three months, the new product will make a big difference.
| A．Hitting | B．To hit |
| C．Having hit | D．Hit |
Mary _______ have arrived ten minutes earlier but her flight was held up because of the heavy fog.
| A．need | B．can | C．should | D．must |
________ you have learned should be made good use of ________ making mistakes in the coming college entrance exam.
| A．What; avoiding | B．That; avoiding |
| C．What; to avoid | D．That; to avoid |
I plan to move to the countryside as the air there is much fresher than________ in the city.
| A．ones | B．that | C．one | D．those |
If ________ into English, the sentence will have a totally different word order from Chinese.
| A．translated | B．to translate |
| C．translating | D．having translated |