1. The accident happened because he drove …………………………... (care) 2. Air …………….……is one of the problems that people have deal to with. (pollute) 3. Traditional ………………..…... are a good source of fun and entertainment. (celebrate) 4. You should buy this book . It’s very…………………………….. (inform) 5. (Tradition)………….………................……., people eat sticky rice cakes at Tet.