One of the most important questions they had to consider was__________ of public health
Being examined twice a year is the rule that every driver _____ obey in this city.
I’m calling to ask for information about the position____ in the local TV news.
It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.
It was the middle of the night_____ my father woke me up and told me to watch the football game.
—Is the chemistry experiment easy? —______. I’ll just do my best.