9. Use Present Perfect or Present Perfect Continuous.
1. Jack (fail) his driving test three times because he doesn't know how to park.
2. However, he (practice) three hours every day for the past week.
3. I think he (make) a lot of improvement.
4. Alice (not/pass) her driving test either because she doesn't know the rules well.
5. She (worry) about this for two months.
6. She (study) the driver's manual for hours every day.
7. She (not/take) another test yet.
8. Her friend Betty (help) her to study the rules for almost two weeks.

1. Jack has failed his driving test three times because he doesn't know how to park.
   (Используем Present Perfect, потому что речь идет о результате и количестве попыток до настоящего момента.)

2. However, he has been practicing three hours every day for the past week.
   (Используем Present Perfect Continuous, потому что действие длилось в течение некоторого времени и продолжается до сих пор.)

3. I think he has made a lot of improvement.
   (Используем Present Perfect, так как говорим о достигнутом результате.)

4. Alice has not passed her driving test either because she doesn't know the rules well.
   (Используем Present Perfect, потому что результат попытки важен сейчас.)

5. She has been worrying about this for two months.
   (Используем Present Perfect Continuous, так как состояние длится уже два месяца.)

6. She has been studying the driver's manual for hours every day.
   (Используем Present Perfect Continuous, потому что действие повторяется и продолжается в течение периода времени.)

7. She has not taken another test yet.
   (Используем Present Perfect, потому что говорится о том, что действие еще не произошло к настоящему моменту.)

8. Her friend Betty has been helping her to study the rules for almost two weeks.
   (Используем Present Perfect Continuous, так как помощь продолжается уже определенный период времени.)

Полностью предложения:

1. Jack has failed his driving test three times because he doesn't know how to park.

2. However, he has been practicing three hours every day for the past week.

3. I think he has made a lot of improvement.

4. Alice has not passed her driving test either because she doesn't know the rules well.

5. She has been worrying about this for two months.

6. She has been studying the driver's manual for hours every day.

7. She has not taken another test yet.

8. Her friend Betty has been helping her to study the rules for almost two weeks.