Выберите нужную форму глагола. 1. before you (leave), don't forget to shut the windows. 2. if you (take) more exercise you (get) fit. 3. he promised he would return the book as soon as he (read) it. 4. unless they improve their attitude towards the work, they (fail) the exam.

1. Before you leave, don't forget to shut the windows.
2. If you take more exercise you will get fit.
3. He promised he would return the book as soon as he (had) read it.
4. Unless they improve their attitude towards the work, they will fail the exam.