The students were ____ over the ____ problem, listening to the teacher with a ____ expression on their faces.
Would it ______ for the city authorities to further restrict parking?
----Why didn’t you come to meet me, Bill? ----Sorry, dear. But I really forgot where I was _____ to meet you.
_______from the moon, our earth, with water _____about 70 percent of its surface, appears like a blue ball.
---Have you got any particular plans for the coming holiday? ---Yes. __________, I’m going to visit some homes for the old in the city.
---Have the arrangements for the concert next Saturday been all _______? ---Not yet. We haven’t found a free hand.