Verbal Ability - Sentence Improvement

Directions to solve :
In questions given below, a part of the sentence is italicised and underlined. Below are given alternatives to the italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.
46.

My friend has a toothache and cannot eat something.

Answer

Answer :

Option A
47.

Since she directing the play for quite some time, she knows the actors really well.

Answer

Answer :

Option B
48.

Why the dinosaurs died out is not known.

Answer

Answer :

Option D
49.

If you are absent for a week, you have to catch with the work when you return.

Answer

Answer :

Option A
50.

Other countries have eradicated this disease ten years ago.

Answer

Answer :

Option A
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