1) Solar power is ___ than coal because it is renewable. a) good b) better c) best 2) Today’s temperature is the ___ of the year. a) hot b) hotter c) hottest 3) This device is ___ than the old one. a) more beautiful b) most beautiful c) beautiful 4) We need to save energy. ___ switching off the lights? a) What about b) How many c) Why don't 5) We need a new idea. ___ a virtual project? a) Why not to b) How about c) How many 6) If we ___ the soil, plants will not grow. a) pollute b) polluting c) polluted 7) If you ___ the battery, the machine will stop. a) switching off b) switched off c) switch off 8) If the climate gets hotter, the ice will ___. a) melts b) melt c) melting 9) Look! The scientists ___ a new app tomorrow. a) test b) are testing c) tested 10) The exhibition ___ at 10 a.m. every Saturday. a) opens b) is opening c) open 11) I ___ that solar power will be more popular in the future. a) believe b) believing c) believes 12) She is ___ that the device will help the environment. a) hopes b) hoping c) hoped 13) They are ___ the factory will not pollute the river. a) think b) believe c) sure 14) We all ___ the future will bring more inventions. a) know b) knowing c) knows 15) The coal oven creates more smoke. The solar panel is ___. a) more cleaner b) cleaner c) cleanest 16) The wind turbine gives energy without pollution. It’s ___ of all three machines. a) useful b) more useful c) the most useful 17) My robot is faster than yours, but Bob's robot is ___. a) the fastest b) faster c) fast 18) You want to suggest building a cleaning machine. What can you say? a) What about designing a cleaning machine? b) What about to design a machine? c) What about design one? 19) You’re testing your invention tomorrow. What can your friend say? a) How about test it today? b) How about testing it today? c) How about we to test it? 20) The robot isn’t moving. ___ adding stronger wheels? a) How about b) Shall c) Why don't 21) Choose the correct sentence. a) If factories will stop, the air is cleaner. b) If pollution stops, the air is clean. c) If factories stop polluting, the air will be cleaner. 22) If we test the new battery, we ___ know if it works. a) don't b) will c) can't 23) I’ve planned everything. I ___ present my project next Saturday. a) will present b) am going to c) am going 24) We just made a decision. We ___ build the windmill tomorrow. a) will b) are going c) going to 25) The Science Fair is already on the school website. It ___ at 9 am. a) start b) will start c) is going to start

G5 Unit 4.5 - Review

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