1. They will install solar panels on the roof of our house next week.
→Solar panels will be installed on the roof of our house next week.
2. Will the plumber check cracks on the water pipes in two days?
→ Will cracks on the water pipes be checked by the plumber in two days?
3. With that device people will change the wave energy into electricity.
→With that device the wave energy will be changed into electricity.
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4. I often walked to school when I was a student.
I used to walk to school when I was a student
5. Although they are short, they still love playing sports.
→ In spite of being short,  they still love playing sports.
6. Our roof will be fixed tomorrow.
They will fix our roof tomorrow.
7. Jakarta doesn't have as many skyscrapers as Shanghai.
→Shanghai has more skyscrapers than Jakarta.
8. Is pollution the most serious problem?
→→ Pollution is the most serious problem, isn't it?
9. Mr Lam lived in the country when he was a child.
→ Mr Lam used to live in the country when he was a child.
10. A group of foreigners visited the slums last week, didn't they?
→→Did a group of foreigners visit the slums last week?
11. I think you should go to work by bike.
→→Why don't you go to work by bike?
12. They are our houses.
=> These houses are ours.
13.Flying from Vietnam to America was so tiring to us.
=>We were so tired of flying from Vietnam to America.
14. I wanted to see a science-fiction film, but we chose a romantic film in the end. (Nevertheless
I wanted to see a science-fiction film. Nevertheless, we chose a romantic film in the end.
15. The music of the film made me feel really excited.(exciting)
The music of the film was so exciting to me.