I'm David．When I was 13,my parents decided that I should go to England to improve my English．I had never been to other countries before，so I felt a little worried．My parents prepared everything for my journey．My plane was due(预期)to leave at 9：30 a．m．and arrive in two hours．I phoned the English family who I would stay with and they told me they would wait for me at the airport(机场)．

Unluckily my plane to London was delayed (延误)．I tried to phone the English family again but I couldn't speak to them because they had already left home for the airport．

When I arrived in London．it was already 1：30p.m．I went to get my luggage(行李)but I couldn't find it．I became very worried．Luckily, the airport staff(工作人员)was very helpful and efficient．I didn't wait long-they found it 10 minutes later．

My English family were still waiting for me! I was so happy! Then my new life in London began．My English family were quite kind．I learned a lot of English because I spent most of the day talking in English．I played computer games with the little boy in my English family．I also taught him how to play chess．Sometimes I told him stories I learned from my family．

I missed my family during my stay in London．but I also feIt sad when my stay there came to an end．My English family held a party for me．I enjoyed it very much．I’ll never forget that summer in London! It is one of the most wonderful experiences I've ever had．

阅读材料，回答问题

材料一：今年两会期间，外交部部长王毅在回应热点问题“一带一路”时，指出：“一带一路”倡议是中国的，但机遇是世界的。这一倡议顺应了亚欧大陆要发展、要合作的普遍呼声，秉持共商、 共建、共享原则，奉行的不是扩张主义，而是开放主义，带给未来世界的，一定是一幅亚欧大陆共同发展繁荣的新的历史画卷。

材料二：历史上，新疆是丝绸之路最重要的起点。今天，无论从地理位置还是决策战略上，新疆 都是“一带一路”的重要节点区城。2015年是新疆堆吾尔自治区成立60周年，天山南北发生的翻天覆地的巨变，让我们进一步感到民族团结的意义重大，也让我们对“一带一路”推动民族团结和共同繁荣充满期待。

Vacation is coming. He is thinking about         .

下图为某国人口增长情况示意图，读图完成下列各题。