UNIT 3一单项选择1.-May I go out now, Dad? -No,you_let your mother know first. A.can B.may C.need D.must2.The little boy _how to take care of himself. He needs help. A.knows B.has no idea C.thinks D.sees3.Could I_a dictionary from you. David? Sorry , I_ it to my cousin yesterday. A. lend; borrowed B. borrow; lend C. borrow: lent D. borrowed; lend4. It is polite_ a gift when you vis