$1$. They plan to make this beach a clean and beautiful place again.
$2$. The students have collected old clothes for their charity programme for a week.
$3$. If we the car all the time, we will make the air dirty.
$4$. Unless I leave now, I'll mis my train.
$5$. If I don't have a quiet room, I won't be able to anything.
HỌC TỐT!