Номер 38 Помогите Пожалуйста!

1.When they were in the United States?
2.Where he was last week?
3.Why she could come?
4.What colour was box?
5.How old was my uncle in 2000?
6.When they washed the car?
7.What they opened?
8.How many countries they visited?
9.What he took?
10.How he skated?