Complete the sentences with the correct form of do or make.
1 I didn't enjoy the exercise class, but it probably _________ me good.
2 He finds exams difficult, but he always _________ his best.
3 It wasn't my birthday yesterday – you _________ a mistake.
4 Both hotels look great, but we have to _________ a choice.
5 I like your new haircut. It _________ a big difference to your appearance.
6 Did you see that motorbike? It was _________ about 200 km/h!