The experiment has（）the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.

单项选择题People have always been （） about exactly how life on earth began.

A. curious
B. excited
C. anxious
D. careful

单项选择题Every year a flood of farmers arrive in Shenzhen for money-making jobs they （） before leaving their hometowns.

A. promised
B. were promised
C. have promised
D. have been promised

单项选择题I haven't seen Sara since she was a little girl, and she has changed beyond（）

A. hearing
B. strength
C. recognition
D. measure

单项选择题—I'm sorry I didn't make it to your party last night. — ______. I know you're busy these days.

单项选择题—My mother is preparing my favorite dishes. Go with me and have a taste, okay —______. And I'll be glad to meet your parents.