1．(2017·全国卷Ⅱ)What the plants pump through the air is a __________ (mix) of chemicals known as volatile organic compounds, VOCs for short.
[答案] mixture
2．(2017·全国卷Ⅲ)But we all have to accept that as we get older our __________ (react) slow down and this often results in people avoiding any potentially challenging driving conditions and losing confidence in their driving skills.
[答案] reactions
3．(2017·长沙质检)It is no use __________ (do) things without aim.
[答案] doing
4．(2017·广东模拟考)You are supposed __________ (arrive) on time, or we'll not finish the task on schedule.
[答案] to arrive
5．He was __________ (astonish) that his answer should have caused such a strong __________ (react)．
[答案] astonished；reaction
6．They came to a __________ (conclude) that nothing is more precious than peace in the world.
[答案] conclusion
