----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 |
We should ________ ourselves assiduously and faithfully to the duties of our profession.
| A．devote | B．spend | C．offer | D．provide |
She returned home from the office, only ________ the door open and something missing.
| A．finding | B．to be found | C．to find | D．found |
________ her work has been good, but this essay is dreadful
| A．In a word | B．In general | C．In particular | D．In total |
They made no effort to hide their amusement ________ I produced a packet of sweets from my pocket.
| A．however | B．whatever | C．whichever | D．whenever |
________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!
| A．How come | B．How dare | C．How about | D．How long |