1 . Later, she studied Chinese medicine for many years with experts in the field, from ______ she gained a deep knowledge about traditional practices. (用适当的词填空)

2 . Our boss is said to come back next week, __________ our task will have been finished. (用适当的词填空)

3 . The old man has two daughters, both of ____________ work as doctors. （用适当的词填空）

4 . In our class there are 46 students, half of ___________ wear glasses. (用适当的的词填空)

5 . The Amazon River, from ________ the rainforest gets its name, is close to 6,400 kilometres in length -roughly 100 kilometres longer than the Yangtze River. (用适当的词填空)

6 . The Amazon river, from ______ the rainforest gets its name, is close to 6,400kilometers in length. (用适当的词填空)

8 . The students, all of   ________ spent the whole day picking fruits, were extremely tired. (用适当的词填空)

9 . The books on the desk, of ________ the covers are shiny, are prizes for us.

10 . I could see a group of around 20 Brazilian dancers and a band in fancy costumes standing in the street, some of __________ carried flags, which blew in the wind. (用适当的词填空)