小题1:I think there will be / is going to be more pollution in 50 years.
小题2:The bridge is about 300 meters long ( in length ) .
小题3:Do / would you mind not smoking in public places / in public ?
小题4:Look , how heavily / hard it is raining !
小题5:Talking / Speaking in front of many / a lot of people makes me feel nervous / tense.
It makes me feel nervous / tense to talk / speak in front of many / a lot of people.