【題目】Every morning my grandfather spends 45 minutes doing physical exercises to (增強(qiáng))his health.

【答案】build；up
【解析】build up。build up 增進(jìn)，加強(qiáng)。每天早上爺爺總是花45分鐘鍛煉身體，增強(qiáng)體質(zhì)。

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