选词填空。
1．—Whose trousers _______ (is; are) these?
—They _______ (is; are) my trousers.
2．It's my father's car. _______ (Her; His)car is white.
3．—_______ (Is; Are) this Liu Zhao yang’s skirt.
—No. It _______ (is; are) Alice’s.
4．—What color _______ (is; are) the socks?
—They _______ (are; is)blue.
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