Срочноооо даю 100 баллов

Ответ:

1.Our teacher will be happy if you do all your homework.

2.if I become rich and famous ,I will donate money to charity  .

3.What will we do if we fail the exams?

4.He's shy . if you speak to him, he will not answer .

5.if it's sunny at the weekend, we will go on a mountain expedition  .