义务教育阶段的英语课程具有______和______双重性质。

单项选择题—We've spent too much money recently. —Well, it isn't surprising. Our friends and relatives（）around all the time.

A. are coming
B. had come
C. were coming
D. have been coming

单项选择题（）from the top of the tower, the south foot of the mountain is a sea of trees.

A. Seen
B. Seeing
C. Having seen
D. To see

单项选择题Tim is in good shape physically（）he doesn't get much exercise.

A. if
B. even though
C. unless
D. as long as

单项选择题Duty is an act or a course of action that people（）you to take by social customs, law or religion.

A. persuade
B. request
C. instruct
D. expect

单项选择题He moved away from his parents, and missed them（）to enjoy the exciting life in New York.

A. too much
B. very much
C. enough
D. so much as