1 . A team of researchers carried out a huge experiment ________ (concern) 218 cities in 39 countries. (所给词的适当形式填空)

2 . He asked several questions __________ (concern) the future of the company. (所给词的适当形式填空)

3 . The engineer and his son held frequent meetings________ (concern) technical problems. (所给词的适当形式填空)

4 . The professor will deliver a lecture c________________ environmental protection. Don’t miss it. (根据首字母单词拼写)

5 . He received a letter from the school ____________(concern) his daughter's academic performance. (所给词的适当形式填空)

6 . The reporter asked several questions________(concern) the future of the company. （所给词的适当形式填空）

7 . The professor will deliver a lecture________(concern) environment protection. （所给词的适当形式填空）

8 . He refused to answer all the questions c________ the quality(品质) of the building materials. （根据首字母单词拼写）

9 . They will have a meeting to discuss something c_______ education. (根据首字母单词拼写)

10 . His article c________ population control was published in the latest issue of China Daily. （根据首字母单词拼写）