21、on holiday 在度假，在休假中
When I was on holiday, I visited my uncle.
Tom and I are going to have a holiday.
I've already had my holidays this year.
A business that attends to the details of transportation, itinerary, and accommodations for travelers.
Also called: travel bureau
He took off his wet shoes.
The plane took off on time. It was a smooth take-off.
The six men got into the car and took off for the park.
24. go wrong v. 走错路, 误入岐途, (机器等)发生故障
25. in all adv. 总共