1.—The math problem is too difficult.Could you show me _____,Alex?

1.—The math problem is too difficult.Could you show me _____,Alex?
—Sure,with pleasure.
A.what to work it out B.what to work out it
C.how to work it out D.how to work out it
2.You can write the new words in your notebook _____ study them at home.
A.and B.but C.or D.for
3.You'd better not ______your door open at night.
A.find B.put C.ask D.leave
4.I understand _________
A.how much my parents have given me
B.how much have my parents give me
C.how many my parents have given me
D.how many have my parents give me
5.Yesterday my friends and I talked about the rules ______ we have in school.
A.what B.when C.where D.that
6._________ to improve our English?
A.What do you think we should do
B.Do you think what we should do
C.What do you think should we do
D.Do you think what should we do