How did you spend your summer holidays? which activites in exercise 8 did you do? find someone who spent the most enjoyable holidays. нужно определить заранее

How did you spend your summer holidays? (Глагол did указывает, что вопрос стоит в простом времени.)
Which activites in exercise 8 did you do? (то же самое)
Find someone who spent the most enjoyable holidays.(глагол spent стоит во второй форме, которая берётся в простом времени.) 
Во всех 3х предложениях употреблено простое время. (Past Simple)

good health is very important for every person. moreover, there is nothing more important than health. wise people even say: “health is above wealth”, because if you don’t care of your health, you can’t study or work properly.

unfortunately, having perfect health is almost impossible nowadays. due to highly polluted environment people suffer from many diseases.

the best way to stay healthy is to do regular morning exercise, to eat healthy products, to sleep at least 8 hours a day and to quit bad habits. the good thing is that people are becoming more health-conscious. in my opinion, the number of smoking and alcohol drinking people is decreasing in our country. this is happening because people started to understand how dangerous these two bad habits are. obesity is another health problem. people, who eat lots of fattening food and do almost no exercise, are often overweight. a healthy diet involves many fruit and vegetables, seafood and wholegrain products. salt, sugar and fat should be avoided. excessive dieting can be also dangerous. some people refuse to eat meat and become vegetarian. however, doctors say that meat is an excellent source of good nutrition.

to my mind, one of the best ways to stay healthy and fit is to go in for various sports. my favourite sport is swimming. i spend a lot of time in the swimming-pool. i think it revitalizes my body and gives me energy for the whole day. other sports i enjoy are cross-country skiing and figure-skating. to stay healthy, it is also important to spend lots of time in the open air. it is especially useful to go for a walk before going to bed.

following these simple rules regularly is the only way to promote our health.

Present simple : what time do you usually get up?
во сколько ты обычно встаешь?

past simple: what did you do yesterday? что ты делал вчера?

future simple: will you visit your granny tomorrow? Ты навестишь завтра бабушку?

past cont: what were you doing when I called you yesterday at 5? что ты делал вчера в 5 ч, когда я тебе позвонил?

present perf: have you ever been to Spain? Ты когда-нибудь был в Испании?

past perfect: by the time you come home, had my mother already left? к тому времени, когда ты пришел домой, твоя мама уже ушла?