用括号里单词的正确形式填空。
（1）I have some                （ envelope ）.
（2）Do you have any            （ paper ）?
（3）He’s            （ fix ）his bicycle.
（4）Tony            （ have ）a hang glider.
（5）He likes         （ swim ）.
（6）Let’s           （ eat ）some carrots.
（7）He wants         （ be ）a doctor.
（8）The children        （ be ）busy last week.
（9）My hobby is         （ collect ）stamps.
（10）The         （ leaf ）are yellow in fall.