¡ªWhat does PM 2.5 mean?

¡ªIt¡¯s a professional ________ indicating the condition of air pollution.

A. term B. item C. number D. mark

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I heard him say so with my _______.

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It is beyond _______ that Professor Tu¡¯s achievement doesn't come from good luck but from her dedication to her research work.

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Jane's grandmother wanted to write children¡¯s book for many years, but one thing or another always got in way.

A. a; ²»Ìî B. the; the C. ²»Ìî; the D. a; the

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Due to the ______ of this medical technology, some diseases can be treated at an early stage.

A. approach B. Appreciation C. Application D. appointment

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We all sighed with ________relief when ________plane finally landed safely.

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We most prefer to say yes to the ______ of someone we know and like.

A. attempts B. requests C. doubts D. promises

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¡ª Why _____ most stars _____ in the daytime?

¡ª Because the sun is too bright.

A. can¡¯t; see B. can¡¯t; be seen

C. weren¡¯t; see D. weren¡¯t; seen

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Jenny, you always _______ your baby too much before bedtime. In fact, it¡¯s  not good for his sleep.

A. excite B. excited C. exciting D. excitement

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