Instruction

Select the best answer to complete the sentence.

1. Please leave a window -------- till I come back home.

2. The high school boy worked so hard to earn -------- for school tuition.

3. Customer reviews indicate that many modern mobile devices are often unnecessarily ------- .

4. -------- I noticed, it was too late.

5. -------- many people are living longer, many people still suffer from poor health.

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