I. 1. films at least once a week

2. can harm your eyesight

3. celebrating the word's unity in diversity

4. my Birthday

5. oxygen and water

II. 1. the biggest

2. more comfortable

3. as tall

4. darker

5. the nicest

III. 1. should

2. can't

3. needn't

4. may

5.  should be

6. can't

IV. 1. in

2. to, by

3. to

4. to

V. 1. went

2. follow

3. are dancing

4. plays