________ (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

Night ________ (fall), we hurried home.

I wonder if he could get it ________ (do) before tomorrow.

Matter is the name ________ (give) to everything which has weight and occupies space.