To facilitate     1     positive change in our bad habits, we must first examine our bad habit cycles and then try to adapt them. We can do this by combining the information from our habit cycles     2     our own positive ideas. We can also use the habit cycle     3     (create) good habits.

From Edmonton, the train     1     (head) southeast across the great Canadian Prairie. At school, Daiyu and Liu Qian had leant that Canada’s population is only     2     (slight) over thirty-seven million. However, they did not anticipate seeing such an open country, and were truly     3     (amaze). They went through two wheat-growing provinces     4     they saw a bunch of farms that covered a very large area.

As there have been so many different styles of Western art, perhaps the best way     1     (understand) Western art is to look at the development of Western painting over the centuries. This began to change in the 13th century with Giotto di Bondone. His     2     (painting) are set apart from other paintings by their realistic human faces and deep emotional impact. Painters concentrated     3     (little) on religious themes during the Renaissance.

    1     12: 30p. m., I found my maths class really difficult,     2     the teacher was kind and     3     (friend). He even told us a funny story, and everyone laughed so much. At 5: 32p. m., I was doing a chemistry experiment. But a guy always tried to speak to me, which made me     4    (annoy).

Cloning has two major uses. First, gardeners use it to produce large     1     (quantity) of plants for sale. Second, it is valuable for research on new plant species and for medical research on animals. Cloning plants is fairly straightforward, while cloning animals is much     2     (complicated) and difficult. Over the years, many scientists failed in their attempts to clone animals, but their determination and     3     (patient) paid off in 1996 with a breakthrough-the cloning of Dolly the sheep.

After breakfast, I pack my bag and set     1    again. Since I must carry all of my food and supplies with me, my bag weighs about 30 kilograms. If today is anything like yesterday, it will be full of sweat and hard work as I hike over this difficult land to my destination on the other side of the valley. However, I cannot complain.     2    (be) in such a beautiful and wild place makes me feel     3     (bless) to be alive. Here I am, alone under this broad sky, breathing the fresh air, and enjoying this great adventure. What could be better?

Tu Youyou was awarded the Nobel Prize in 2015 for her research,     1     led to the discovery of artemisinin. Artemisinin has saved a large number of lives since it was discovered. After     2     (graduate) from university, Tu Youyou worked at the China Academy of Traditional Chinese Medicine. In 1967, Tu Youyou     3     (choose) as a researcher of a team of scientists with     4     purpose of discovering a new treatment for malaria.