An excellent teacher is believed to be one who devotes (奉献) himself to the children but asks for nothing .
----Why can’t I smoke here? ----At no time_____in the meeting room.
Helen plays the piano well, ____her favourite instrument is the violin.
The young man, ___two attemps to climb the high mountain, decided to have another try this year.
The boy was caught ____in the examinaton room and was later punished for that.
It was not until Mum agreed to take her to KFC, ____was her favorite, ____the spoiled girl stopped crying.