EX 5:
1, doing
2, writing
3, taking / to take
4, playing
5, collecting
6, riding
7, watching
8, washing
9, listening
10, eating

EX 6:
1, working
2, to visit
3, make
4, helping
5, taking
6, doing
7, play
8, to watch
9, socialising
10, surfing
11, watching
12, preparing
13, shopping
14, surfing

Ex5
1. My sister enjoys doing aerobics in the morning.
2. Lucia fancies writing emails after dinner.
3. In his free time, Quang likes taking/to take photographs.
4. Are you interested in playing handball, Peter?
5. Vinh's brother loves collecting foreign coins, doesn's he?
6. David hates riding a bike to school on rainy days.
7. I prefer watching DVDs to going to the cinema.
8. Nam detests washing the dishes every day.
9. We don't mind listening to classical music
10.The Robinsons adore eating Vietnamese food.
Ex6
1.Working
2.to visit
3.Make
4.helping
5.taking
6.doing
7.play
8.to watch
9.socialising
10.surfing
11.watching
12.preparing
13.shopping
14.surfing
.