B3U1

1. The student spends twice as much time on online games as on his schoolwork.

2. I had been worn-out and unable to concentrate until I refreshed myself with an icy towel.

3. Armed with only swords and arrows, the aboriginal tribe had fought courageously until their last warrior was killed.

4. The slaughter of the protesting students brought the already tense situation to a boiling point.

5. A self-disciplined student with a sense of responsibility never misses a deadline.

6. The bronze statue is three times heavier than the gold one.

B3U2

1. In addition to being the tallest building, Taipei 101 is regarded as one of the main tourist attractions in Taiwan.

2. The mother finds it increasingly difficult to communicate with her son.

3. In contrast to a big city with busy streets, the small village has a landscape full of natural beauty. 

4. The controversy over invasion of the privacy kept the company from beginning the service. 

5. The man's consistent hard work was recognized by his boss.  Better yet, he got a big raise.

6. Whoever is interested in the colonial past of the country should visit this museum.

7. The salesman deserved his success because he always kept the needs of customers in mind.