This is the first study to compare the        effects of the new drug with its side effects.

Since the man had no choice but to fight back, we’d better _________ him.

—Why do you choose to work in an international travel agency?—Well，you know，English is my ________.So it is my best choice.   (2012·福建，25)

A man is being questioned in relation to the _____murder last night.

When I opened the door, I found my father sitting in his chair, completely ______ in the humorous stories he was reading.