12. _ their customers, supermarkets _ as possible
1. Having attracted and kept
2. As if to attract and keep
3. In order to attract and keep
4. Attracting and keeping
1. want to make shoppers as plasant
2. have made shopping as plesing
3. must try to make their shoppers as pleasing
4. have tried to make shopping as pleasant
13. In most countries around the world. _ to school _.
1. children having to go
2. children must go
3. every child has been
4. every child must have been
1. when they reach a certain age
2. as they are growing old enough
3. since they reached a certain age
4. if they are tooold to learn