【推荐1】My teacher tells us math is difficult but u__________, because it can help us with problems.

【推荐2】What do you think is ________ (useful) invention in the world?

【推荐3】Mary doesn’t like science, but her father says it’s ________ (use) .

【推荐1】Computers are very ________ (use)to our whole family.

【推荐2】I hope my suggestions are ________ (有帮助的) to you.

【推荐3】This book is very________ (有用的) to me. I want to buy it.

【推荐1】根据句意及汉语提示完成句子中的单词
1. I can ________ (闻)something burning in the kitchen.
2. Would you like a chocolate ________ (小甜饼)?
3. Most green fruit is ________ (酸的).
4. The ________ (比萨饼)is about the size of a dinner plate.
5. You seem to have put too much ________ (盐)in this dish.

【推荐2】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. Barack Obama has made many __________ in different universities.（speech）
2. The young mother is happy to see her two-year-old son dressing __________.（he）
3. Jenny complained to the __________ about the poor service in the shop.（manage）
4. On Sundays my mother will wake me up a bit __________ than usual.（late）
5. Van Gogh was __________ the most well-known painter in the world.（probable）
6. Peter has to put more effort into the project if he wants to __________.（success）
7. Words can hardly describe how __________ I was on hearing the news.（excite）
8. Taking up different hobbies will help add __________ to your life.（various）