1)the air in the city is very (pollute) 2)please listen to the lecture (care) 3)if the continues what will happen?(pollute) 4)he was that they were not coming (disappoint) 5)he is going to all the bags (collection) 6)we'll make this beach clean and again(beauty) 7)why don't we go for a picnic on the weekend? let's 8)let's go to work by bus what about 9)nga is a good english speaker nga speaks 10)unless you get a visa you can't visit the united states if you 11)if you don't suceed you'll have to try it again unless 12)i suggest collecting unused clothes let's 13)she failed in the exam because she was lazy(because of+noun phrase) 14)ba is tired he stayed up late watching tv(because) 15)hoa broke the cup she was careless(since) 16)we were disappointed she didn't keep her promise(adj+that)