One should remain ______ and think of ways to escape when facing danger.
__________ you understand the rule, you will have no further difficulty.
—Tony, you must have noticed the student who broke the window. —I’m sorry. I _______ attentively.
He didn’t seem to mind_____________ TV while he was trying to study
Staying one day in a Shangri-la Hotel costs _______ renting a house in my hometown for a month.
_______ not to drive after drinking, some drivers are still trying their luck, which is really dangerous.