Sure, here are the gaps filled in with either the Present Perfect or the Simple Past tense:

**Bài 10: Fill in the gaps using either Present Perfect or the Simple Past**

20. What **happened** to you?
21. **Have you read** "Harry Potter" when you were a child?

Last week I **met** an old lady called Cindy. She **was** eighty-two. She **told** me the story of her entire life. I **was** so sad when she **finished** it that I almost **cried**. As I **talked** to her, I **felt** sorry for her, I **gave** Cindy some money.

This morning something wonderful and amazing **happened** to me. I **met** Cindy again, but my goodness, she **was** different. She told me the following. Since you **gave** me that money my life **has changed** completely. With the money you **gave** me I **bought** a lottery ticket and I **won**. I **bought** myself a house where I'm living now. I **also bought** some new clothes, a TV set... you can't imagine how happy I am! I **was** so astonished that I couldn't even say a word. I **followed** her and surprise! She **bought** me a yellow Ferrari.

**BÀI 11: Fill in the appropriate tense: present perfect or past simple**

1. I **saw** that programme about telepathy last night.
2. He **came** back from Uganda a week ago.
3. Last week, he **phoned** me to inform me about the matter.
4. He **has traveled** a lot recently.
5. Claire **had** an appointment at the hairdresser's yesterday.
6. He's the most difficult customer I **have ever had to** deal with.
7. Sales **rose** in 2001, but then **fell** again in 2002.
8. We **signed** a binding contract last year which is still valid.
9. I feel really tired. I **have just finished** my homework.
10. Look at George! He **has had** a haircut.