用be动词的适当形式填空。
1.My sweater_________ on the bed.
2.—_________ your shorts blue?
—No, they _________.
3.—What color _________ his shoes?.
—They _________ black.
4.—How much _________ her yellow sweater?
—It _________ 20 dollars.
5.—How much _________ the red socks?
—They _________ 5 yuan.
6.—_________ the white shirt cheap?
—No, it _________.
