Vice-President Xi Jinping’s five-day official visit 48.________ the United States from Monday starts this year’s high-level interactions between China and the US.

49._______ countries have attached great importance to Xi’s visit, because it is meant to further advance their cooperative partnership based on mutual respect and mutual benefit. The new tone for China-US ties was set by President Hu Jintao and US President Barack Obama 50._____ Hu paid 51._____ state visit to the US at the beginning of last year.

Xi is expected to settle the details of bilateral relations with US officials 52._____ that the two sides can fulfill the commitments they have made and expand 53._____ ties further.

China-US relations have progressed 54._____ imagination and the friendship between peoples of the two countries has deepened greatly since Xi’s last visit to the US 27 years ago. 55.______ the average one-day bilateral trade volume is more than $ 1.2 billion today is just one proof for that.

模具中滑块间隙是为了保证滑块的（）﹐同时保证（）。