单选题 Michael ______ here to see you and he ______ a note on your desk.

单选题 I couldn't have got to the meeting on time ______ an earlier train.

单选题 We're leaving at six o'clock, and hope ______ most of the journey by lunch time.

单选题 Nearly ______ of the surface of our planet is covered by water.

单选题 It is a rule in his family that ______ comes home earlier should cook the dinner for the family.

单选题 ______ is quite natural, a beginner can't read the books written in English very quickly.

单选题 — You don't look so well, Mary. What's the matter with you? — Why? ______.

单选题 — You forgot your keys when you left home in the morning. — Good heavens, ______.