The English language teaching business will become the victim of its own success,______ may be astonishing to you.

Thinking helps people control their own destinies. Those who avoid thinking run therisk of ______.

______ a long way ahead of you if you want to be a good English teacher.

If it ______ rain heavily, the city would have great trouble because of its poordrainage system.

One of the main reasons is that making furniture ______ vast quantities of trees.

Keep your life ______ so that things don"t get you down.

Body language is a powerful communication system, ______ it can signal verydifferent things.

—Should I hand in form right now?

—No. ______. And when you finish it, call me please.

甲对乙说：“我在你这么大的时候，你是我今年的一半。”乙对甲说：“我到你这么大的时候，你的岁数是我今年岁数的2 倍减 7. ”甲现在( )岁。

将整数分为正整数和负整数，这样的分类违反了概念分类原则中的 ______。