решить по английскому 283 упражнение???

Exercise 283. Use the demonstrative pronouns that (those) to avoid the repetition of the preceding noun.

Model: This stadium is better than the stadium in our town. -
This stadium is better than that in our town.

1. Our flat is more comfortable than the flat of our neighbour. 2. The price of a motor car is higher than the price of a motor cycle. 3. The windows of our classroom are larger than the windows of our flat.
4. Though he is young, his face is like the face of an old man. 5. The sum of 5 and 7 is equal to the sum of 9 and 3. 6. These flowers one more beautiful than the flowers growing near our house.

1. Our flat is more comfortable than that of our neighbour.

2. The price of a motor car is higher than that of a motor cycle.

3. The windows of our classroom are larger than those of our flat.

4. Though he is young, his face is like that of an old man.

5. The sum of 5 and 7 is equal to that of 9 and 3.

6. These flowers are more beautiful than those growing near our house.

1. this medicinal herb is good for eczema and skin blemishes.

is this medicinal herb good for eczema and skin blemishes?

this medicinal herb is good for eczema and skin blemishes, isn't it?

is this medicinal herb good for eczema or skin blemishes?

when is this medicine herb good?  

2. lemon balm is versatile medicinal herb.

is lemon balm versatile medicinal herb?

lemon balm is versatile medicinal herb, isn't it?

is lemon balm versatile medicinal herb or not?

why is lemon balm versatile medicinal herb?