MACMILLAN SKILLFUL 1 UNIT 6 THE EMPTY QUARTER

1 The tree and plant traces here (a)   that this area was once very green.

My professor has been to the Arctic more than a (a)   times.

Salar de Uyuni is a (a)   salt flat located in Bolivia.

The pleasant weather (a)   allowed the plants to grow tall.

There has been a complete

(a)   of rain here for six weeks.

Polar bears hunt at the (a)  

of the ice- sometimes swimming,

sometimes running.

Death Valley and Joshua Tree Park (a)  

in a very dry area

of California.

My uncle has traveled to all the continents (a)  

Antarctica.