It's duty of every man to work. The life of a lazy man is of no use to himself and to others. If the man is too lazy to work, he will usually become a not useful man. Everyone, when he is young, should learn some useful work.
    But it's not enough for a man to learn some kind of work. He should put his heart and soul (精力) into his work, and not waste his free time. “Work while you work and play while you play” is as good rule for young people as old.
    There is no better to help to diligence than the habit of early rising, and this, just like all other good habits, is most easily formed in youth (青年). There is an English say “Lost time never returns.” This means that everybody must be diligent, and make good use of time. One must study hard when one is young so that one can make great progress, succeed in life and become useful to one's country. So we can say that diligence is the mother of success.

我国沉船打捞人员在南海打捞宋朝的商船。潜水员在水面下作业，当他继续下潜的过程中，他所受的水的浮力和压强的变化，以下说法正确的是（   ）

近年来，雾霾天气逐渐增多。对此，有网友调侃：“遛狗不见狗，狗绳提在手；见绳不见狗，狗叫我才走。……世界上最远的距离，是牵着你的手，却看不见你的脸。”这告诉我们（　　）

John: Uncle Smith, this is John speaking. I'm sorry to call up so late, but may I speak to Jim?

Smith: Jim is out.____

John: OK, please. Jim and I applied to go in an adventure (冒险) tour competition on the internet a week ago. Today I was told that we were accepted.

Smith: Oh, that must be dangerous.____

John: Because we want to do sports and something exciting.

Smith: You'd better not.____

John: Uncle Smith, don't worry. We can take good care of ourselves.

Smith:____

John: Yes. We are ready for it.

Smith: Good luck.

John:____

Smith: It's OK. I'll tell him to call you back later.

John: Thank you, Uncle.

A. Are you ready for it?

B. May I take a message for you?

C. You're welcome.

D. Why do you want to do it?

E. What a great idea!

F. We will worry about you.

G. Thank you very much.