Question

Ex 1: Rewrite these following sentences using "must/ mustn' 
1. A scooter will be easy to ride. (It)
2. Our jetpacks are more powerful than yours. (ours)
3. Are you interested in hyperloops? (interest)
4. It isn't a good idea to travel such a long way by motorbike. (should)
5. Electric cars don't pollute the air, but they still cause traffic jams. (however)
6. I am talking to one of my classmates. (mine)
7. I live near my school, so I usually walk there. (foot)
8. A solowheel runs on electricity, so it is safe for the environment. (Because)
9. My family will travel to Phu Quoc by plane. (a)
10. My friends prefer not to go in a taxi because it's expensive. (by)

Answer 1

It will be easy to ride a scooter

Your jetpacks are not as powerful as ours

Do you have an interest in hyperloops?

You should not travel such a long way by motorbike

Electric cars don't pollute the air; However, they still cause traffic jams

I am talking to a classmate of mine

I live near my school, so I usually go there on foot

A solowheel is safe for the environment because it runs on electricity

My family will take a flight to Phu Quoc

My friends prefer not to go by taxi because it's expensive

Answer 2

1. A scooter will be easy to ride. (It)

It will be easy to ride a scooter
2. Our jetpacks are more powerful than yours. (ours)

Your jetpack is not as powerful as ours
3. Are you interested in hyperloops? (interest)

Do you have an interest in hyperloops?
4. It isn't a good idea to travel such a long way by motorbike. (should)

You shouldn't travel such a long way by motorbike 
5. Electric cars don't pollute the air, but they still cause traffic jams. (however)

Electric cars don's pollute the air. However, they still cause traffic jams

Answer 3

6. I am talking to one of my classmates. (mine)

I am talking to one classmate of mine
7. I live near my school, so I usually walk there. (foot)

I live near my school, so I usually go there on foot
8. A solowheel runs on electricity, so it is safe for the environment. (Because)

Because a solowheel runs on electricity, it is safe for the environment
9. My family will travel to Phu Quoc by plane. (a)

My family will take a plane trip to Phu Quoc
10. My friends prefer not to go in a taxi because it's expensive. (by)

My friends prefer not to go by taxi because it's expensive