Choose the correct option in each sentence below.
1. It takes more than a / an hour to drive to Can Tho.
2. It’s a / \(\varnothing\) tradition for children to wake up early on Christmas Day.
3. The Ok Om Bok Festival takes place in the / \(\varnothing\) October.
4. We went to Can Tho by an / \(\varnothing\) air.
5. A: Where’s a / the book?
B: I thought you left it next to the TV.