The best job is_______which uses your skill in doing something together with your interest in the subject. 

Clothing made of man-made fibers has certain advantages over ______ made of natural fibers like cotton，wool or silk.

 –How many students are there in the classroom? --__________. They are all in the lab.

She finds ＿＿＿＿＿＿ boring ＿＿＿＿＿＿ at home. 

(2014·石家庄高中复习教学质量检测)Seeing a large crowd at the street corner，I became aware of________unusual happening.