Ответ:
1.I have no idea how to help her.
2.I don't know where to go on vacation.
3.Do you know how to pass Independence Square.
4.I can't choose going home or spend the night in the country.
5.She explained to me how to make a salad.
6.I can’t decide what to wear for the evening.
7.I don’t know when to start planting potatoes.
8.I don’t know where to buy this book.
9.I have no idea how to drive a car.
10.I don’t know what to give him for his birthday.