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. |