I.单项选择（16分）
1. Every time Mom and Dad want to have a(n) thei r ____________ conversation , they close the door of their room.
A. interesting B. exciting C. private D. natural
2. –What would you like to drink, coffee or tea?
--________is OK. I don’t really mind.
A. Both B. Each C. Every D. Either
3. Is this museum th e one _______your friends visited last Monday?
A. who B. where C./ D. in which
