4th B3U3 vocab

vi. make a long low sound, e.g. because you are in pain or unhappy

v. speak about sth. in a way that shows you are unhappy

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a. (fml.) creating problems for sb.

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n. [C] a small group of people or things that are very close to each other

v. form a small close group

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1) (+ a. / ad.) in a way that is impossible to doubt and easy to see

2) (BrE) in a way that shows you are very certain about sth.

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a. sth. that is compulsory must be done because of a rule or law

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vt. balance the effect of sth., with the result that there is no advantage or disadvantage

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n. [U] the practice of flying planes

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1) look at sb. or sth. for a period of time in a way that shows you are thinking

2) consider doing sth. in the future

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1) fill sth. completely with a large number of things or a large amount of sth.

2) make sth. completely wet

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1) very great in amount or degree

2) without limits in space or time

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