35. The survival of the natural world depends on each and every one of us.
36. I think we should put garbage bins around the schoolyard to prevent lazy students from throwing trash and keep our environment clean.
37. ...been serviced for five months
38. If the spaceship is in orbit round the moon, the astronaut will be weightless
39. Because of the rough sea, the children couldn't go swimming
35. The survival of the natural world depends on each and every one of us
36. I think we should put garbage bins to prevent lazy students from throwing trash and keep our enviroment clean.
37. My car hasn't been serviced for 5 months
38. If the spaceship wasn't in orbit round the moon, the austronauts would't be weightless
39. Because of the rough sea, the children unable to go swimming
