根据所给中文，用单词的正确形式填空。

1. More and more             (来客) are coming to visit China.

2. You can't take the             (杂志) out of the library.

3. Outdoor             (活动) are good for our health.

4. He wants to be a             (歌唱家) when he grows up.

5. I always feel             (不舒服) after I have ice cream.

有19根小木棒，摆成一圈，每两根小棒之间放一盆一串红，共要多少盆一串红．