Gerund as subject or object – Exercise 1

Is the Gerund in the following sentences used as a subject, object or as a complement?

1 Sailing is great fun. →

2 She hates staying out at night. →

3 Fishing is my hobby. →

4 Smoking is bad for your health. →

5 Do you enjoy cooking? →

6 Climbing can be dangerous. →

7 Doing housework is boring. →

8 My favourite activity is using my computer. →

9 Why don't you like ironing? →

10 What he really likes is going on foot. →