题干
The best things in life are free! 生命中最好的东西是免费的！
点拨：____ 表示"免费的"，"有空的"，例如：
我周一到周五很忙，但是周末我有空。____
你可以拿走这本书，它是免费的。____
答案(点此获取答案解析）
free,I'm very busy from Monday to Friday, but I have some free time on weekends.,You can take this book with you—it's free.
