He went out to play football, leaving his homework _________.
---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.