题目

请用适当的词完成下面的短文。每个空只能填写一个形式正确、意义相符的单词。Lucy is a girl, and she is 11 years . She often helps her mother do some shopping. Today, she goes to the supermarket with her . They will buy many things, today is her father's birthday. At first, they buy apples, because her father says are very healthy. Then, they buy some candies, because her brother likes them. Her mother doesn't her brother to eat them much. dinner, they buy beef and fish. Lucy about her grandfather. He chicken, so Lucy asks her mother to buy some chi（10分）完成下面的证明：已知，如图，AB∥CD∥GH，EG平分∠BEF，FG平分∠EFD，求证：∠EGF=90°．证明：∵HG∥AB（已知）∴∠1=∠3（ ）又∵HG∥CD（已知）∴∠2=∠4（ ）∵AB∥CD（已知）∴∠BEF+___________=180°（ ）又∵EG平分∠BEF（已知）∴∠1=∠_____________（ ）又∵FG平分∠EFD（已知）∴∠2=∠_____________（ ）∴∠1+∠2=（___________+______________）∴∠1+∠2=90°， ∴∠3+∠4=90°（ ）即∠EGF=90．