7. Complete the story about a lake with the correct variant. Lake Svityaz 1) is / was / were quite small, and it 2) takes / is taken / took about two hours to walk around it. In 1970, it 3) becomes / become / became a protected area.

Речь идёт о прошлом описании озера и событии 1970 года, поэтому используются формы Past Simple.

Lake Svityaz was quite small, and it took about two hours to walk around it. In 1970, it became a protected area.