giúp mik với ạ xin mn 31. There are 30 _________________ in the English – speaking contest. ( participate) 32. A contest attracts the _________________ of more than one thousand students all over the country. ( participate) 33. It is a contest in which _________________ have to read two poems in English. ( participate) 34. We used to _________________ in many activities of communal center in my neighborhood. ( participation) 35. How do people organize these ___________________ ? (act) 36. Nga and Hoa are going to the movies. They enjoy ____________________ movies. (act) 37. The most popular __________________ at recess is talking. ( act) 38. She _______________ participates in social work. ( act ) 39. We should collect glass, paper, cans ect. to make our ________________ clean. ( environmental ) 40. There are more and more people concerning about _________________ pollution. ( environment)