1.That exercise is more difficultt exercise is more difficult than this exercise.
2.The red car is more expensive than the black car.
3.That film is more boring than this film.

4.That river is shorter than this river.

5.Miss Nga is younger than Miss Lan 
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1. That exercise is more difficult than this one.

2. The red car is more expensive than the black one.

3. That film is not as interesting as this one.

4. That river is not as long as this one.

5. Miss Nga is younger than Miss Lan.