World Wetlands Day (WWD) occurs on the     1     (two) day of February each year. It marks the date     2     the International Convention (公约) on Wetlands was signed in 1971 in Iran. WWD     3     (celebrate) in 1997 for the first time. It aims to help people realize the     4     (important) of wetlands around the world. The 158 nations that signed the convention promised to protect over 1,782 wetlands, covering     5     area of over 160 million hectares (公顷). The United Kingdom tops the list with 177 protected wetlands. Each year governments and citizens’ groups carry out     6     (vary) activities on WWD. These range from nature walks, clean-up days     7     new government laws to protect the wetlands.

The world’s wetlands serve an important role in nature. They are all mini eco-systems and contain a huge diversity (多样性) of animal and plant life. They take the form of ponds, streams, rivers and so on. They also serve an important role in the defence of floods,     8     (protect) an area from being flooded by storms and high tides. Wetlands are also a wonderful way     9     (explore) nature and see a huge diversity of water life, plants, animals and birds. Sadly, many wetlands around the world     10     (be) under threat now with rising sea levels and global warming. It is vital that we protect them.

e-Day celebrates the mathematical constant e, which has a value of 2.7182818. It     1     (celebrate) on February 7 in countries that follow the month/day (m/d) date format. Also known as Euler’s number, after the Swiss mathematician Leonhard Euler, e is one of     2     (important) numbers in mathematics, including 0, 1 and pi   (π). e is also sometimes called the Napier’s Constant and is often     3     (incorrect) referred to as Euler’s Constant.

Many European countries celebrate Euro Day, sometimes also     4     (call) e Day. The day is observed on January 1 and celebrates the anniversary of the     5     (adopt) of the Euro, Europe’s common currency in 2002. In New Zealand, eDay is a day     6     people can get rid of e-waste or old electronics such as     7     (computer) and old appliances so they can be recycled rather than being placed in a landfill. Engineer’s Day is observed in Paducah, Kentucky on February 21, where many people participate in     8    egg drop contest, create edible (可食用的) cars, and tape people to walls.

The year is full    9     mathematical and scientific holidays. Some of these include: Yellow Pig Day, Mole Day, Fibonacci Day, Palindrome Day, and Pi-Day. Use our Date Pattern Calculator    10     (find) out other interesting calendar dates during the year.

The Shoton Festival is one of    1    (important) festivals for ethnic Tibetans. “Sho” means yogurt and “Ton” banquet in the Tibetan language, so the Shoton Festival    2    (call) the “Yogurt Festival.” as well. The seven-day event occurs between the end of the sixth     3     the beginning of the seventh month of the Tibetan calendar.

Originating(起源) from the mid-11th century, the Shoton Festival used to be a religious activity. After 1642, the Drepung Monastery(寺庙),     4     the fifth Dalai Lama, leader of the Gelug Sect of Tibetan Buddhism, lived became the     5    (politics), religious and cultural center of Xizang. Every year on the 30th day of the sixth month, thousands of people would crowd     6     the monastery to present yogurt to the fifth Dalai Lama and asked for     7    (bless). Local Tibetan Opera troupes would also come to perform for him at the monastery. Since then, the Shoton Festival     8    (become) a religious and cultural festival.

During the period of the eighth Dalai Lama    9    (live) in the mid-18th century, the main venue of the Shoton Festival was moved to Norbulingka and ordinary people were allowed     10    (enter) to watch Tibetan Opera performances. From then on, the Shoton Festival became a fixed festival.