2. Complete the 1st conditional sentences with the verb in brackets

Решение:

Для завершения предложений в 1 условной форме необходимо использовать Present Simple в if-clause и Future Simple (will + инфинитив) в main clause.

1. If you do not help me, I will not pass the exam tomorrow.
2. If my dad gives us a discount, we will buy this car.
3. If David is able to repair my bike, he will not give up smoking.
4. If my dad will not marry him, 5 Mary will be able to repair my bike.

Ответ: do not help, will not pass; gives; is able, will not give up; will not marry, will be able.