2 Underline the correct word in each sentence. 1 There is a park nearby where we can fly our kites. 2 A hot-air balloon uses heat to go up in the air. 3 The first aeroplanes couldn’t make very long flights. 4 I always get good grades in Physics. I like Science a lot! 5 Raise your hand if you know the correct answer. 6 Alex is studying Earth Science because he wants to know everything about our planet.