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1. ___________ is the most expensive city in the world? I think it's Tokyo 
A. What.     B. Where.      C.when.      D. How
2.___________ is your favorite tennis player? I don't like tennis 
A. where.     B. who.    C. How often.     D. How long 
3. My brother can't swim _________ he's afraid ________ water 
A. because -of.     B. and- about.     C. but-of       . D.so-to
4. My sister likes going to the cinema ________ I like watching TV at home
A. and.    B. But.    C. Because         D. or
5. ________ pen is this ? Can I borrow it?
A. whose.     B.whom         C.who.      D. which 
6. _________ are you going to invite to your party next week?
A.what.     B.who.       C.whose.      D. where
7. ______ did you spend in Hanoi? - One week 
A. How many.      B. How much.      C. How long.    D. How often