I do not think ads are veryuseful,______?A.do I B.aren't the

I do not think ads are veryuseful,______?A.do I B.aren't the ( ) 2.I am a student,______?A.isn’t I B.am I C.aren’t I D.do i suppose you're not serious.A don't i B do iC aren't you D 补全对话A:The buses are late,aren't they?B:Yes,I think so A:Are 语法题,I suppose you are not serious,________?A.do I B.don't I ( )that she did not do a good job,I do not think I am oder t they,interesting,do,I,are,think,not Do you think the girl is__thin?No,I don't think so.A a few B I think the park are lovely.so ( )I.A.am .B.do C.have what do you think of the show?A,never mind B,i can t stand i I THINK YOU ARE A JAPANESE,AREN'T YOU? I’m Chinese,--------?A am not I B aren’t I C are I D am I