1 They spent 10 days on finishing the work 2 How long will it take you to write operation 3 How long does is take you to go to school by bike every day 4. The students are busy preparing for the games 5 He do two hours' homework everyday 6 Swimming is good for our health 7. To eat too much sugar is bad for our teeth 8. To learn math well is very difficult 9 He spent half an hour doing housework yesterday 1 They spent 10 days on finishing the work 2 How long will it take you to write operation 3 How long does is take you to go to school by bike every day 4. The students are busy preparing for the games 5 He do two hours' homework everyday 6 Swimming is good for our health 7. To eat too much sugar is bad for our teeth 8. To learn math well is very difficult 9 He spent half an hour doing housework yesterday