1) Simple machines _______(be) important because they are used in many modern inventions today. a) am b) is c) are 2) Scientists and doctors _______ (be) studying and researching Alzheimer's Disease. a) am b) is c) are 3) The only solution to solve this problem _______ (be) to communicate with your classmates. a) am b) is c) are 4) My family will _______(travel) to America this summer holiday. a) travel b) travels c) travelling 5) You can ________(borrow) a pencil from your friend if you don't have one. a) borrow b) borrows c) borrowing 6) His English is improved a lot by _________ (read) lots of English books. a) read b) reads c) reading 7) Frogs have gills for _________(breathe) in the water.  a) breathe b) breathes c) breathing d) breatheing 8) The coloured paper in our class is used for _____(make) lanterns.  a) make b) makes c) making 9) She ________(study) English on her smartphone every day, using Apps like Duolingo and Oxford Reading Buddy. a) studys b) study c) studies 10) People _______(use) AC to get cooler, but my mum _____(use) an electric fan.  a) use; uses b) use; use 11) Wind farms ________(have) many wind turbines in one area. a) have b) has 12) Wind power _______(make) 4% of the electricity we use. a) make b) makes 13) The sun ____(shine) on solar panels, and electricity ______(be) made.  a) shine; is b) shines; is c) shines; are 14) If you look carefully, you will _____(see) solar panels in your area. a) see b) sees 15) Biomass _______(be) green energy because people _____(plant) new trees or crops after they use it. a) is; plant b) are; plants c) is; planting

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