1. It is very useful when you go to a cave.

2.Mount Everest is the highest mountain in the world.

3. If we had a map ,we wouldn't get lost.

4.A trip to the Himalayas is an unforgettable experience.

5. It is necessary to do the homework.

6. Is building taller than house?

7. There are a lot of modern houses in the center of the city.

8. It is 2 km from my home to the downtown.

$1$. It is very useful and when you go to a cave

$2$. Mount Everest is the highest mountain in the world

$3$. If we had a map, we would not get lost

$4$. A trip to the Himalayas is an unforgettable experience

$5$. It is necessary to do the homework

$6$. Is building taller than house ?

$7$. There are a lot of modern houses in the center of the city

$8$. It's 2km from my home for the downtown