Besides proper diet, exercise is one of the key ___________of a healthy lifestyle.
| A．categories | B．components | C．ranges | D．processes |
----Does Liu 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 |
The boss praised the young man for his hard work, though he ___ experience.
| A．was lack of | B．was lacking in | C．lacks of | D．was lacking of |
I'll have you _______ English in six months .
| A．speaking | B．speak | C．spoken | D．be able to speak |
I posted the letter some time _____ the week .
| A．in | B．during | C．throughout | D．within |
If you ______ stop smoking , you can only expect to have a bad cough .
| A．won't | B．would not | C．do not | D．can not |