Give the right form of the words. 1. He left the room without any ( explain ) ________. 2. Nobody likes him because of his ( tidy ) ________. 3. You have a wide ( choose ) ____ between traveling or stay at home. 4. We haven't talked to each other recently because of ( understand ) ________. 5. Now many Vietnamese students volunteer to work in ( mountain ) ________ areas. 6. Many ethnic minority students from the ( north ) _____ Highlands. 7. We should provide ( transport ) ________ to schools. 8. There is a ( vary ) _____________ of food in this supermarket.