A、When a customer needs an airplane to replace his own. B、When a customer needs some tools to mend the airplane. C、When a custom

M: Alexandra, where did you work before?
W: I worked at an airport. Or I can say I worked in Aviation.
M: You worked in Aviation?
W: Yes, my previous job was to write contracts for an aviation company. We bought and sold airplanes and aircraft engines, so we did a lot of marketing and leasing. We also speak to people from different countries and airlines wanting to buy equipment. So there are a lot of negotiations.
M: Can you explain what leasing is?
W: Leasing happens when our company owns a piece of equipment, either an airplane or an engine and a customer has a need. For example, if their airplane has to do some maintenance and they need a replacement, then we will let them use our airplane for a certain number of months, like you renting a car. Same thing, same idea.
M: Oh, wow. And you lease out not only the planes but engines as well?
W: Sometimes you have an airplane that’s delayed at the airport because of some reason and they need to swap an engine out, or whatever.
M: Right before the plane takes off, they sometimes switch engines?
W: They’ll take the passengers off and put them on another plane because it takes a lot longer than the 10- or 15-minutes turnaround.
M: So can I lease a pilot?
W: You can, yes, you can lease a crew. Yes! It’s called a wet lease, and we used to do dry leases meaning we only provided the equipment but a wet lease includes a full crew that will fly the airplane, flight attendants, etc.
Questions 1 to 4 are based on the conversation you have just heard.
1.What did Alexandra use to do?
2.When will leasing happen according to the woman?
3.What will the passengers do if the engine needs to be changed before the plane takes off?
4.What do we know about dry lease and wet lease?