Unit 1: old older young younger tall taller long longer short shorter strong stronger big bigger small smaller fat fatter thin thinner heavy heavier
Unit 2: low lower high higher slow slower fast faster late later early earlier far farther well better
Unit 3: get on/ get off/a shopping centre/a history museum/a post office/a middle school/a primary school/a train station/turn left/turn right
Unit 5: spring summer autumn winter warm cool sunny cloudy rainy windy
Unit 6: have a picnic/go on an outing/see a play/see a Beijing opera/take part in a singing contest/take part in a sports meeting
Unit 7: an email/a fax machine/a telephone number/writing paper/an envelope/a postcard/glue
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