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1. If I _____ help with a school project, I look online.                                                              a. needed  b. need  c. will need  d. had needed

2. If a piece of iron _____ in the open air, it rusts.                                                                        a. leave  b. is left  c. leaves  d. was left

3. If Ali had joined the school trip, he _____ a happy day.                                              a. would be  b. has  c. would have  d. had had

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