Lesson 13I. 根据括号中所给的汉语用适当的词语填空。1. Its _（必需的）to help the poor.2. Is there anything _（严重的）with your uncle?3. Danny _（挂）his clothes on the line just now.4. _（安全）is the most important thing at present.5. Please be _（小心的）when crossing the street.II. 根据句意用适当的介词填空。1. Jenny is scared _ walking in the dark.2. Tony put the ladder _ the wall and climbed up.3. There is a little window _ top of the house.4. Li Ming, what happened _ you this morning?5. Theyll have a meeting in this hall and we are cleaning it _ the meeting.III. 对画线部分提问，每空一词。1. Jenny writes to her parents twice a month. _ _ _ Jenny write to her parents?2. Her pet dog has been dead for a week. _ _ has her pet dog been dead?3. There is only one apple on the table. _ _ _ is there on the table?4. Its two kilometers from here to the zoo. _ _ is it from here to the zoo?5. Danny lay on the chair just now. _ _ Danny lie just now?IV. 连词成句。1. having, are, breakfast, they _?2. book, you, which, prefer, do _?3. for, let, copy, you, Danny, them _.4. look, here, her, to, they, for, came _.5. understand, they, doesnt, said, what, he _.Lesson 13I. 1. necessary 2. serious 3. hung 4. Safety 5. carefulII. 1. of 2. against 3. on 4. to 5. forIII. 1. How often 2. How long 3. How many apples 4. How far 5. Where didIV. 1. Are they having breakfast2. Which book do you prefer3. Let Danny copy them for you4. They came here to look for her5. He doesnt understand what they said