Grammar and Vocabulary write the correct alternatives to fill in the blanks: The scientific study of sound waves - (are/is/was) known as acoustics. Although music - (can be/will be could be) hard to define, it - (was/will be/is)often described as a meaningful arrangement of sounds. fill in the blanks with appropriate articles and prepositions. Malala Yousufzai born - 12th July 1997, is - Pakistani activist - female education. Do as directed: The teacher said to the students, "Don't waste your time.[change into indirect speech]
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the first one is 'in' and the second is also 'in'. the indirect of it is "the teacher oddered to the students to don't waste their time".
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The scientific study of sound waves is known as acoustics .
Although music can be hard to define , it is often described as a meaningful arrangement of sounds.
Malala Yousufzai born on 12th July 1997, is a Pakistani activist for female education.
The teacher asked us to not waste our time.
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