问题
填空题
用所给词的适当形式填空。
1. What do you think is the most______(help)invention?
2. Edison was a great (invent). He had many______(invent) during his lifetime.
3. What______electric slippers (use)for?
4. Personal computers (invent) in 1976.
5. —What is the knife used for?
—It's used for (cut) things.
答案
1.helpful 2.inventor; inventions 3. are; used 4. were invented 5. cutting