【推荐1】Without k________ we can’t do things well, so we must study hard.

【推荐2】He was aware of the power of ________ and technology after taking part in this activity. (know)

【推荐3】We’d better study harder to get lots of k____________

【推荐1】To keep healthy, you need to eat more ________ (fish) and vegetables.

【推荐2】The Chinese government has done a lot to control plastic____________（污染）in big cities.

【推荐3】Complete the sentences with the given words in their proper forms.（用括号中所给单词的适当形式完成下列句子。每空格限填一词）：
1. We are all proud that paper cutting is one of the greatest _______ in China.   (invent)
2. The dancing room is on the _______ floor of that building. You can go from here.   (five)
3. “Would you tell _______ about your trip to England?” the children asked Uncle Joe.   (we)
4. No one knows ________ about his life in England.     (clear)
5. When we were flying at a _______ of 80,000 meters, I felt excited. (high)
6. Today we have more _______ to decide our own future than before. (free)
7. It is said that Captain King has got a very ________laser torch.     (power)
8. It’s _______for her to get full marks in maths because she is not good at it.   (usual)