Điền cách từ sau vào các câu cho phù hợp : already , ever, for, just, never, since, yet 

1. I haven't listened to their new CD ... Is it any good?

2. We've been waiting for you ... over an hour. Where have you been?

3. Have you ... been to the UK before?

4. I'm afraid we've ... made plans for this weekend, so we won't be free.

5. Pedro has been having English lessons ... he was five years old.

6. It's strange that you mention the film Crash. I've ... read about it in the paper.

7. I've ... heard of a 'sudoku'. What is it?