单选题 _______ the wealth of the country increases, more and more waste will be produced.

单选题 I read the letter _______ I walked along the river.

单选题 As I _______ the newspaper, Granny _______ asleep.

单选题 _______ the day went on, the weather got worse.

单选题 _______ I am ill, I can't go.

单选题 —I'm going to the post office.
—_______ you're there, can you get me some stamps?

单选题 _______ I was going out, the telephone rang.

单选题 Mother was worried because little Alice was ill, especially _______ father was away in France.