完成句子。

1. Daming is             the phone for Sam.

2. —_           don't you eat a hamburger?

    —That's great.

3. —             did they play football yesterday morning?

    —At school.

4. —             are you going to do?

    —I'm going to buy a kite.

一射击运动员在一次练习中打出的成绩是 （单位：环）：7，8，9，8，6，8，5，10，这组数据的众数是（    ）。