Activity 3 – Fill in the blanks with suitable words from the text. The first letters of words are given : (a) As a subject, h ____ is quite interesting (b) We have good relations with our neighbouring c ____. (c) Plants need air, water and sunlight to g ______ (d) Can you I ____ how big the Universe is? (e)You should s ____ regularly if you want to be a good student.