用所给词的适当形式填空。

1. This was his _____ (two) time to cook.

2. It's hard for me_____ (drive)a car.

3.  Mark is a _____ (Russia) and he lives in  Russia all his life.

4. She doesn't have any _____ (hobby). But she likes studying very much.

5. I hear some _____ (foreign) will  visit our  school next week.

说明随机函数的BASIC表示法，并编制一个简单的随机函数程序。