Please . Your brother is sleeping!
A:keep quite
B:keep quietly
C:to be quiet
D:be quiet
— Where is Mr. Green, do you know? I have something to tell him.
— He to Hong Kong for a meeting. He home three days ago.
用一张长12.56分米,宽6.28分米的长方形铁皮圈成一个圆柱铁皮桶侧面,若另用铁皮给这个铁皮桶配上底面,至少需要____或____平方分米的铁皮.(接头处忽略不计)