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P17-18 I. 略 II. triangle, square, rectangle, round/circle III. 1-5BCBCC 6-10AABCA 11-14ABCA IV. 1-5BBBCB 6-10BBCAB V. Name P19-20 I. 略 II. 1. see, sea 2. their, there 3. right , write 4. no, know 5. sun, son 6. hear, here 7. I, eye 8. for, four III. B-A-D-F-E-C 2—3—4—1 IV. 略 V. 略 P21-22 I. 1-5 ehabc 6-10 gifjd II. 1. He is playing tennis. Yes, I do. 2. They are playing hockey. No, I don’t. III. 略 IV. twelve, January, second, of, Spring Festival, third, on, fourth, on, May, it, it, June, June, sixth, seventh, September 10th, on, October, eleventh, December, twelfth, Christmas | 
