What impresses me most is ______ he appears in front of others, he wears a sincere and charming smile.A.which B.that C.where D that whenever
---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.