Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.
With the final exams coming, Mark, the top student in our class, is not worried about Chinese, and _________ English.
It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
Many Internet users make _____ most of the half-price promotion and it is _____ good opportunity for online shopkeepers to get their names known.
After she made herself up, she herself in the mirror.
at the airport, he was arrested by the police.