Perhaps the most familiar plant movement belongs to one species of mimosa called the sensitive plant. Within seconds, it can lower its leaves and make its tiny leaflets close up like folding chairs. This movement is thought to be initiated by electrical impulses remarkably similar to nerve signals in animals. But without the animals' sophisticated motion machinery, the mimosa has had to be creative in devising a way to move.

  For motion, the plant depends on tiny, bulb-shaped organs located at the base of each leaf stalk and leaflet. Called pulvini, these organs hold the plant parts in place. When the mimosa is stimulated--say, by a crawling insect or a sudden change in temperature--an electrical impulse sweeps through the plant. This causes potassium and then water to be shifted from certain cells in the pulvini to others, quickly turning one side of the organs flaccid. Because the pulvini can no longer support the leaves and leaflets, this shift results in a corresponding change in their position.

The passage is mainly concerned with the ______.

Passenger: Taxi! (A cab stops and he goes in.)

Cab driver: ______?

Passenger: King's Hotel on North Street.

Tony: Will you please pass me the saltshaker, Bill?

Bill: Sure.______

Tony: Thank you.

Mother: Danny! Don't make any sound when you have your soup.

Danny: Yes, Mum.

Father: ______.He's only a child.

Husband: Can I wait at the coffee bar? I feel ill at ease when you are picking things out.

Wife: ______.I don't want to shop alone.You can always give me advice, or enjoy looking at beautiful women.

Husband: Don't talk nonsense.

Lucia: Do you have any tissue, Polly?

Polly: Here.______

Lucia: Thanks.I have a terrible headache.It seems to be flu.

Bus driver: Move to the rear of the bus, please.There are plenty of seats.

Passenger: ______ ?

Bus driver: Forty cents.Drop it in the box.

Stephen: Well, hello, stranger! ______

Gordon: No, I went to California for-a few weeks.

Stephen: Oh, really? Where did you go?

Gordon: Los Angeles.I stayed with my brother.

Mother: Jimmy, what are you hiding behind your back? Let me see.

Jimmy: It's kitty.Please let me keep it.It's a good kitty and will not bring you any trouble.

Mother: ______ I told you.No pets.It'll make a mess of this house.

Sophia: There'll be an issue next month introducing your newly published book and I'd like to have an interview with you, if possible.

Josh: An interview? I'd like to, but I'm afraid my schedule is all full.

Sophia: It won't take you long, Mr.Josh.______.

Mother: Tom, it's 7:30, you're going to be late for school.

Tom: I feel like another five minutes' sleep.

Mother: ______ Get dressed.