单项选择题 Our force has been（）from the dangerous area.

单项选择题 He is universally recognized as an authority on construction engineering so one of his jobs is（）the building work.

单项选择题 It’s getting late and I have to leave now.（）

单项选择题 Which brands are you familiar with？（）

单项选择题 The pebbles are the other things in life that matter，but on a small scale.（）