The old man had been to this teacher’s home several times but he still had trouble （）it. 

单项选择题Thebestwaytoreadnewspapersistoread（）.

A．extensively and thoroughly
B．occasionally and carefully
C．frequently and with certain skills
D．in details every day

单项选择题You（）ourbossinherofficelastFriday,shehasalreadygonetoParis.

A．needn’t have seen
B．must have seen
C．might have seen
D．can’t have seen