1. keen on - быть сильным в ч-либо
2. fond of - обожать
3. mad about - быть без ума от ч- либо
4. good at- преуспевать в ч-либо
5. interested in - интересоваться ч - либо
ex2
1. a
2. b
3. c
4. a
5. b
ex3
1. Sue goes swimming every week.
2. They don't play volleyball on Sundays.
3. Tom is playing dart now.
4. Do you enjoy painting?
5. Are they doing the shopping at the moment?
ex4
1. study
2. walks
3. goes
4. is helping
5. work
6. is traveling
7. wakes
8. are not taking
9. doesn't cook
10. is singing