which part of the given sentence has an error?

She don't speak of either German or French.

 In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".

At one time, the lock industry here flourished and locks (was exported) on a major scale.

In the following question, out of the four alternatives, select the alternative which is the best substitute of the words/sentence.

Made or done in the traditional or original way

In the following question, out of the four alternatives, select the alternative which is the best substitute of the words/sentence.

Senseless talk or writing

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.

Let your hair down

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.

Don't put all your eggs in one basket

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Let us examine the facts in the case more ____________. First of all, language is no more ____________ a medium; it is like air to the creatures of the land or water to fishes. If it is perfectly clear and pure, we do not notice it any more than we notice pure air when the sun is shining ________ a clear sky, or the taste of pure cool water when we drink a glass __________ a hot day. Unless the sun is shining, there is no brightness; unless the water is cool, there is __________ refreshment.

there is __________ refreshment.

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Let us examine the facts in the case more ____________. First of all, language is no more ____________ a medium; it is like air to the creatures of the land or water to fishes. If it is perfectly clear and pure, we do not notice it any more than we notice pure air when the sun is shining ________ a clear sky, or the taste of pure cool water when we drink a glass __________ a hot day. Unless the sun is shining, there is no brightness; unless the water is cool, there is __________ refreshment.

when we drink a glass __________ a hot day.

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Let us examine the facts in the case more ____________. First of all, language is no more ____________ a medium; it is like air to the creatures of the land or water to fishes. If it is perfectly clear and pure, we do not notice it any more than we notice pure air when the sun is shining ________ a clear sky, or the taste of pure cool water when we drink a glass __________ a hot day. Unless the sun is shining, there is no brightness; unless the water is cool, there is __________ refreshment.

sun is shining ________ a clear sky,