1.

Today the weather isn't as cold in London as on the south coast.
Today the weather ...

THAN

 .

2.

The river Thames is shallower here than it is further east.
The river Thames is ...

LESS

 .

3.

The streets are wider here than in the old town.
The streets are ...

NOT

 .

4.

In Mexico City it doesn't rain as much in the winter as in the summer.
In Mexico City in the summer, rainfall ...

HEAVIER

 .

5.

Nowhere in the world is as dry as the Sahara desert.
The Sahara desert is ...

PLACE

 .

6.

Saudi Arabia is one of the hottest countries in the world.
Few countries are ...

AS

 .

7.

Poland is not as mountainous as Romania.
Poland is ...

FLATTER

 .

8.

In a storm it's safer to be on land than at sea.
Storms are ...

MORE

 .

9.

Pakistan exports more cotton than anything else.
Pakistan's ...

SUCCESSFUL

 .

10.

The fog isn't nearly as thick this afternoon.
This morning the fog was ...

MUCH

 .