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1、 We were lucky to see the bird in the zoo last weekend.（rare）
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2、 The for cheating in exams is very strict in our school. （punish）
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3、 Students who are late for class by their teacher every morning at school. （punish）
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4、 Students who don't follow the classroom rules next week. （punish）
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5、 Those students because they didn't hand in their homework on time.（punish）
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6、 We must every chance to improve our English. （value）
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7、 Empty plastic bottles are if we don't recycle them. （value）
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8、 These old books are kept carefully in our school library. （value）
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9、 This old photo has great for my family.（value）
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10、 The broken bridge is , and no one is allowed to cross it. （danger）
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11、 We should try our best to protect the animals. （danger）
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12、 Crocodiles are . Don't touch them, or you will be in .（danger）
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13、 The (die) plant will come back to life if we water it often.
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14、(nature), we should protect the rivers and forests around us.
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15、 This kind of plant (typical) grows in warm and wet places.
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16、 The (value) advice from my teacher helped me a lot.
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17、 Some animals (lose) their lives because of the serious pollution.
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18、 The (miss) bird finally flew back to its nest in the tree.
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19、 He went to school (with) having breakfast this morning.
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20、 You can ask the teacher (direct) if you have questions.