—How about your trip to Hainan
— It couldn't have been ______. Sometimes I went swimming in the sea; sometimes I lay on the sand.

单项选择题______ she realized it was too late to go home.

单项选择题Some researchers feel that certain people have nervous systems particularly to hot, dry winds. They are what we call ______ weather sensitive people.

单项选择题______ is best known for the technique of dramatic monologue in his poems.

单项选择题Salaries for（）positions seem to be higher than for permanent ones.

A.legal
B.optional
C.voluntary
D.temporary

单项选择题Before we started out, we'd better ______ the time of the next train in the time table.