1/ The (science).................................................................................can know when a volcano will erupt. 2/ The village was (complete)....................................................destroyed by the typhoon last week. 3/ Many people become (home).............................because of the (nature).........................disasters every year. 4/ (Tidal) ...............................waves are the result of an abrupt shift in the underwater movement of the earth. 5/ He was very tired, so he walked (slow)........................................................................................................ 6/ If we go on littering, our environment (become)...............................................................seriously polluted. 7/ Tet is the most (importance).........................................................................festival for Vietnamese people. 8/ Do you know the reason for (celebrate).................................................................................Mother’s day? 9/ We are very (pride)............................................................................................................of our fatherland. 10/ They take part in many (culture)..................................activities in their town. 11/ Easter is a (joy)..............................festival which is (celebrate).....................................in many nations. 12/ Everybody cleans and (decoration)...............................................................................the houses for Tet. 13/ She is always (worry)............................................about her children because she lives far from them. 14/ He is an (active)............................in the town charity program. He is very (active)................................ 15/ Pompeii was completely destroyed in AD. 79 by an (erupt).......................................of Mount Vesuvius. 16/ We can reduce garbage by (recycle).......................................................................................waste things. 17/ He (learn).....................................English since he was ten years old. 18/ My teacher suggests (put)....................................garbage bins around the schoolyard. 19/ If you can’t find your place, he (help)..................................you to get there with this map. 20/ What might happen if the (pollute)..................................................................goes on?. They live (happy).........................................................................................although they are very rich.