连词成句。 1. are, they, sightseeing, who, going, with ____________________________? 2. wants, vacation, David, exciting, an ____________________________. 3. Peter, taking, is, long, a, vacation, summer, this ____________________________. 4. about, plan, some, ask, can, your, I, vacation, you, questions ____________________________? 5. He, going, his, house, is cousin's to ____________________________.