--I don’t have a partner to practice English_____.

--Why not join an English language club to practice_____?

A．/; speaking

B．with; to speak

C．/; to speak

D．with; speaking

下列哪一组牙不需要替换（）

A.中切牙

B.侧切牙

C.尖牙

D.前磨牙

E.磨牙