The Chinatown in San Francisco is the     1     (big) in America. It is a very popular tourist draw     2     receives many visitors each year.     3     (historical), Chinese immigrants settled in the area during the railroad construction and gold rush period. Now the     4     (major) of residents in Chinatown are still ethnic Chinese.

Most of Chinatown     5     (destroy) in the 1906 earthquake, but the city and residents rebuilt it,     6     (take) care to include lots of Chinese architecture. There are many famous sites in Chinatown including the Tin How Temple, Bank of Canton and Portsmouth Square,     7     (name) but a few. People can find     8     unique range of souvenirs, goods, and clothing in the stores in the Chinatown. But perhaps     9     people treasure most is its food that     10     (suit) everyone’s taste.

The Palace Museum has announced that all entrance tickets are now being sold online, a move     1    (save) visitors from queuing to buy tickets at the gate.

October 2nd was the first day the museum, also known as the Forbidden City, sold all     2    (it) 80, 000 daily tickets online. For visitors     3     have not bought tickets in advance, museum staff will assist them to purchase tickets on their mobile devices by scanning a QR code (二维码).

    4    (base) on current sales data, between 15, 000 to 20, 000 tickets per day are available to be purchased on site     5    (use) the QR code. That amount is approximately what was     6    (previous) sold through 30 ticket booths in two hours. If visitors are unable to purchase their tickets online, for example the elderly, foreign tourists     7     those without e-payment, staff at the museum can book tickets online on their behalf.

A trial of the online ticketing service began on September 25th, 2011. Last year, around 77 percent of the tickets     8     (book) online. The museum began to limit daily visitors to 80, 000 in June 2015, preventing excessive numbers of tourists during holiday periods.

Since 2012, the museum     9    (receive) at least 15 million visitors each year, with     10     number of visitors hitting 16 million last year.

4 . The adobe dwellings(土坯房)     1    (build) by the Pueblo Indians of the American Southwest are admired by even     2    most modern of architects and engineers. In addition to their simple beauty, what makes the adobe dwellings admirable is their     3    (able) to “air condition” a house without     4    (use)electric equipment. Walls made of adobe take in the heat from the sun on hot days and give out that heat     5    (slow)during cool nights，thus warning the house. When a new day breaks, the walls have given up their heat and are now cold enough       6    (cool) the house during the hot day:       7    the same time, they warm up again for the night This cycle        8    (go) day after day: The walls warm up During the day and cool off during the night and thus always a timely offset(抵消)for the outside temperatures. As     9    (nature) architects, the Pueblo Indians figured out exactly     10    thick the adobe walls needed to be to make the cycle work on most days.