3 The children volunteer to clean up the local park........ there are lot of used cán and trash there A but B because C and D so 4 The children ate too much sweet....... they get toothache easily A so B and C but D because 5 I've never..... very well with my brother. We've got completely different personalities A got off B got on C got away D got up 6 ...... lion dacing is very popular in Viet Nam, my friend Andy dóe not enjoy it A But B although C if D however 7 I think we should...... up our neighborhood A to clean B clean C cleaning D cleaned 8 Our teacher suggests..... a meeting to discuss about the solution to kepp our environment clean A to hold B hold C holding D held 9 The" Green Sunday" was short: ...... the students enjoyed it very much A but B because C however D although 10 Hoa missed the but thí morning,..... she went to schooll late A but B so C however D and 11 Can you turn....... The lighst? It's too dark A on B off C in D for 12 What are you looking......? My picture book. I've lost it A on B off C for D after 13 There are.... saving methods and inventions to use solar energy. A energetic B energize C energy D power 14 A new-conditionner will be....... this morning A to install B install C installing D to install 15 scientists are looking for an.... way to eduse energy consumption A effect B affection C effective D effection 16 We can.... easily in the daylight A to reat B reading C read D readable 17 she won't take all these suitcases..... she likes to travel lightly A so B but C becase D and 18