- ________ (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.
- I shall never forget ________ (meet) the late Premier Zhou during his inspection of our factory.
- Matter is the name ________ (give) to everything which has weight and occupies space.
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