我不清楚啊!

我不清楚啊!
6.Suzhou is ______ most beautiful tourist city and I believe I’ll come for _____ second time.
A.the; a B.a; a C.the; the D.a; the
7.— Have you heard today’s weather forecast?
— Yes.Better weather is ______.We can expect an outing.
A.in the way B.by the way C.on the way D.in this way
8.— Can I tell my best friend about it?
— No,I don’t want anyone else to know it.You _______ keep it to yourself.
A.must B.need C.can D.may
9.Is this school __________ you visited last month?
A.where B.the one where C.that D.the one
10.When I handed the report to Peter,he said that David was the right person ________.
A.to send it to B.to send C.to be sent D.for sending
一定要解释语法!