Exercise Twenty-One
　　1. We had better _________________（天天锻炼身体）.
　　2. _______________（为了不影响他们），we left quietly.
　　3. _____________（我答复她）that I would accept her invitation.
　　4. According to the newly-announced policy，we should ________________（努力搞活国有大中型企业）.
　　5. It has become an utmost urgency that ________________（必须清除政府中的贪污腐化现象）.
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