29 Environmental
30 qualified
31 informative
32 harmful
33 effectively
34 responsibility
35 We are making a prawn salad which is a favorite of mine
36 I have to get up at 4a.m because it's the only time when I can concentrate on my work
37 It is compulsory for teachers and students to sing the national anthem in school on Mondays
38 They had the doctor test his eyes
39 It's a pity I can't speak English fluently
40 The teacher said all the homework had to be done carefully
