确立教育在社会主义现代化建设中的优先发展战略地位，提出“科教兴国”战略是因为

在下面一段文字横线处补写恰当的语句，使整段文字语意完整连贯，内容贴切，逻辑严密。每处不超过12个字。

    俄国教育家乌申基说：“好习惯是人在神经系统中存放的道德资本，这个资本在不断增值，使人终生享受它的利息。坏习惯是无法偿还的道德债务，这种债务以不断增长的利息折磨你。

    ①____。”由此看来，好习惯是前进路上的加油站，坏习惯是②____。习惯支配人生，习惯的好坏决定人生的成败，真可谓③____。

情景对话

A：Would you like to have dinner with me this evening, Bob? 

B： ____ . Maybe another time.

A：What are you doing?

B：I'm making aplan____

A：What plan? Is it very important?

B：Yes, I always do volunteer work on the first Saturday of every month.

A：____

B：I help out at the children's hospital. I help to plan some activities.

A：____

B：Of course. You should help to make the sick children happy.

A：____ I can tell them some interesting stories.

a. Oh, I'd love to do that.

b. I must finish it on time.

c. Sorry, I can't. I'm busy.

d. Err…Bob, could I join you?

 e. What kind of volunteer work do you do？