【1】—Who________(is/ are) you?

—I ________(am/ is) Mary.

【2】Where ________your friends going? (is/ am/ are )

They ________ going to the zoo.

【3】Her cousins ________ (visit/ visits) Tianjin every year.

【4】He goes to school ________ (in/ on) time.

【答案】

【1】 are am

【2】 are are

【3】visit

【4】on

【解析】

略