five hours to the meeting, David learnt that it had been postponed.
| A．Having driven | B．Driven | C．Being driven | D．To be driven |
________ the prices and functions of different types of computers before you make up your mind which to buy.
| A．To compare | B．Comparing | C．Compared | D．Compare |
-- Are you fond of watching TV?
--- Not a bit. I would sit alone in the dark _______ I would watch TV.
| A．before | B．if | C．while | D．after |
--- Does Li Hua serve in the army?
---No, but he________ in the army for three years.
| A．served | B．has served | C．is serving | D．would serve |
Nothing is so easy as ________ parents to raise their expectations of their children too high.
| A．of | B．for | C．by | D．to |
History is the best teacher. It _______records the development path of each country and foretells the future to us.
| A．apparently | B．conventionally | C．faithfully | D．eventually |