помогите подобрать верный вариант ответа.заранее спасибо!

1)Make sure you wear a hat when you're out in the ____ weather.

A.steaming

B. boiting

C. baking

2)we __ for three hours before we decided to take a break.

A. must be trekking

B. had been trekking

C. have been trekking

3)A good way to __ a problem is to think about it calmly and carefully.

A. win

B. beat

C. gain

4)Sue wanted to change the appearance of her living room, so she _____ by a professional interior designer

A. decorated it

B. had it decorated

C. had decorated it

5)Neither Annabel __ Sue has ever flown in a plane

A. or

B.and

C.nor