There is __________ “u” and __________ “n” in the word “unhappy”.

A. a；an                    B. an；a               C. a；a                     D. an；an

There is _______ “u” and _______ “f” in the word “unfamiliar”.

There is       “u”and          “l” in the word “ruler”.

A. a;a                            B. an;an                                C. a;an                                   D. an;a

There is ______ “u” and ______ “s” in the word “bus”.

A．a, a              B．a, an             C．an, an            D．an, a

There is______ “u” and ______ “s” in the word “use”.