選擇適當?shù)脑~填空，使句意完整。
1. I can't _____________ (see, sea) anything.
2. This _____________ (pear, pair) of shoes is too cheap.
3. Many _____________ (child, children) like playing with snow.
4. _____________ (There, Their) are some knives.
5. She _____________ (has, have) a good friend at school.
6. We are going to _____________ (buy, bought) a dictionary tomorrow.
