16. Eric didn't feel at ________ ease in the party, because he was afraid of losing ________ face.
A．the; a B．an; 不填 C．an; the D．不填； 不填
17. Alice liked all her classes in the technical school, but she liked the sewing class ________.
A．in total B．in general C．in detail D．in particular
18. —Does your sister work as a teacher in Canada?
—No, but she once ________ there for 5 years.
A．taught B．had taught C．has taught D．would teach
