The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
The Dragon Boat Festival is held every year on May 5th _______ a patriotic poet called Qu Yuan.
Though he was born of a rich family, Tom left home at the age of 15, ____ to make his own living.
As a student, you have to take into consideration the part a good way of learning will _____ in your studies.
As a good friend of his, I offered Tom my congratulations ______ his passing the college entrance exams.
-- _____ you make so much noise, Mary? Your father is sleeping now. --Sorry, Mum. I’ll take care not to.