第二部分选择填空(共20小题;每小题1分,满分20分)21.—Have you seen _______ pen? I left it here this morning.—Is it _______ black one? I think I saw it somewhere.
The company can't afford to buy the latest equipment at present.____,they keep trying new ways to improve efficiency.
____ up early in the morning to have a walk, I am sure, you are likely to feel active all day.
"They didn’t take measures in time, otherwise the explosions ____."some experts said.
Please don’t make so loud noise.The news of the volcanic eruption in Indonesia ____and I want to listen.
The doctor’s treatment has worked marvels: the patient has completely.