-----Where _____you put the ruler? I can't see it anywhere.----I put it right here. But now it is ____.
---Where is my pen? --- I _____it.
The man ______ you are talking is in the next room.
— I feel really disappointed not to have got that job. — Don't worry. Maybe something better will ______.
We_____ the old scientist________ his contribution________ the country.
Every student is required to watch the teacher carefully before ___ the chemistry experiment.