1、The map is on the wall of ___(they)mother's room

1、The map is on the wall of ___(they)mother's room
2、Please come in and have a cup of tea of with ____(we)
3、同学们用彩纸制作了20个圆柱形灯罩,每个灯罩高35厘米,底面周长是47.1厘米,至少用多少彩纸?
4、一块蜂窝煤大约用煤多少立方分米?（高9厘米,底面直径12厘米,中间有10个圆柱形的小圈每个直径2厘米）