Unit 1

Tall-taller, shorter-shorter, stronger, older, younger-younger, bigger, heavier, heavier, longer, thinner, thinner, smaller-smaller.

2 unit

Fever, sore throat, cold, toothache, toothache, headache, troublesome nose, pain, tiredness, excitement, happiness, boredom, boredom, sadness, sadness, sadness, sadness.

Unit 3

Watch-watch and wash-clean-clean and play-play and visit-visit last weekend-go to the park-go swimming in the park. Swimming, swimming, fishing, fishing, reading, hiking, hiking, outing

Unit 4

Learn to sing and dance like China people-sing and dance and eat delicious food-eat delicious food and take photos-take photos and climb. Buy Gifts Buy Gifts Boating-Boating Boating See Elephants-Watching Elephants Go Skiing-Going Skiing-How about Skating? How to get to the end? The rest, stay at the end.

References:

http://220.202.29.65/ReadNews.asp? News ID=2077