4. Most of us have some difficulty in telling the differences between American English and British English.

3. Thanks to the doctor’s correct treatment, the patient was saved.

2. The scientist referred to the discovery as the most exciting new development in this field.

1. Real friends should have everything in common.

5. confusing; confused

4. belongs

3. Comparing

2. putting

1. persuading

2. various3. various4. varied