1. Complete the sentences. Circle the right letter.
 1. During the storm, the ... are very dangerous for ships and sailors.
       a. hills       b. mountains      c. cliffs
 2. The Sahara ... is the largest on the planet.
        a. valley   b. desert                c. park
 3. In big cities, lots of people are fond of ... . They usually run  in the parks and along the streets. 
       a. cycling      b. hiking     c. jogging
 4. The ... of mountain Everest is 8,848 metres.
          a. height    b. lenght   c. high
 5. Each country has its own ... of nature. For example, Rassia is famous for its Lake Baikal.
      a. works     b. wonders      c. surprises
2.  Complete the text. Fill in the definite article THE if necessary.