Раскройте скобки,употребляя требующуюся форму прилагательного:
11. Who is the (attentive) student in your group?
12. A bus is (fast) than a tram.
13. The (tall) trees in the world grow in California.
14. Oil is (light) than water. 15. He worked (hard) and (hard) as the end of the term came nearer.

11) Who is the most attentive student in your group?

12) A bus is faster than a tram.

13) The tallest trees in the world grow in California.

14) Oil is lighter than water.

15) He worked harder and harder as the end of the term came nearer.

11) most attentive

12) faster

13) tallest

14) lighter

15) harder; harder