设函数y=y（x）由参数方程

曲线y=x(1+arcsin2/x)的斜渐近线方程为_______

________ (catch) in the rain, he was wet to the skin.

________ (fail) several times, they need some encouragement.

The floor does not look so bad when ________ (sweep) clean. 

Some molecules are large enough ________ (see) under the electronic microscope.

We were busy ________ (get) things ready for the trial production when he phoned us.

A beam of light will not bend round corners unless ________ (make) to do so with the help of a reflecting device