. Many a professor _____ looking forward to visiting Germany now. Many scientists _____ studied animals and plants in the last two years.
Everyone stood up _____ the hero came into the lecture hall.
So far, the moon is the only one of the heavenly bodies in space ______ reached by manned spaceships.
According to an old proverb, red sky at night often indicatesfine weather the next day.
单项填空 (共15小题, 满分15分) ——May I take your order now? —— . —— OK, I’ll come back in a few minutes.
He set off down the main street. He _____.