Drinking a lot of alcohol is likely to cause physical, emotional or social problems.

Social Problems

Explanation:

Technically drinking a lot of alcohol can do each of these but I think for your question it will be social problems because you won't want to go out without a drink and most people don't want to be around that, you also will find it difficult to process things which your brain needs to process certain things when being social.

1. TRUE
2. false - compare to 3.
3. TRUE - compare to 4.
4. TRUE - the sum of exernal angles of any convex polygon is 360°
5. false - compare to 4.
6. false - compare to 7.
7. TRUE - the angles are supplementary
8. false - compare to 4.

The true statements are 1, 3, 4, 7.