Ответ:

1 She is sure that he will not manage the catch the train.

2 Next year we will travel together around Europe.

3 the athletes soon will return from the competition.

4 His parents think Jim will become a doctor one day.

5 They have bought new sports shoes. They will start running next week.

6 It's getting dark. I will turn on the light.

7 they will be eighteen next month.

8 Scientists for sure will find a cure for this disease.