Sure, here are the completed sentences:

**Exercise 5. Complete the sentences using Present simple or Simple future tense.**
1. The yoga course **begins** on 7th July.
2. I think she **will visit** her grandparents tomorrow.
3. The train **departs** from platform 5 at 11.30.
4. When **does** the art exhibition **end**?
5. My daughter **will be** fifteen next week.
6. **Does** the plane **take** off at 10 p.m. as usual?
7. **Will you open** the door for me, please?
8. I don't think the new shopping mall **will open** tomorrow.
9. There's no need to hurry. The concert **begins** at 7 o'clock.
10. The train **does not leave** at 10.15. It **arrives** at 10.15.

**Exercise 7. Underline the correct answers.**
1. The convenience store in my neighbourhood **opens** 24/7.
2. Mom, I **will make** a shopping list for you to give to the shop assistant.
3. We **won't go** on a holiday this summer vacation.
4. The bus schedule says that there **is** a bus to Hoan Kiem Lake at 9:00.
5. The show **begins** at 8 o'clock.
6. What time **is** your flight?
7. Our final exams **start** next week.
8. I think he **will pass** the exam.
9. Next Friday at 9 o'clock there **will be** an English speaking contest.
10. Perhaps, it **will rain** tomorrow.

**Exercise 8. Complete sentences with a suitable preposition.**
1. This salad is made **from** home-grown vegetables.
2. Shopaholic is a person who is addicted **to** shopping.
3. We sometimes go round and look at things **on** display.
4. Some luxurious brands are rarely **on** sale, are they?
5. Can I use these vouchers **for** the next shopping?

**Exercise 9. Choose the correct answers.**
1. I prefer to do my **shopping** at shopping malls.
2. In our group, most people spend most of their money **on** clothes.
3. She should call the shipping company to complain **about** the problem.
4. What do you like about shopping at a **convenient** store?
5. Some people go to shopping centres to **avoid** the heat or cold outside.
6. We can **sometimes** bargain at a supermarket.
7. My grandmother **always** goes to the market to buy food. She goes there every day.
8. Do you like **home-grown** products?