.A proper approach to ________ your learning efficiency is of great significance to every student.
He showed a great __________ for languages.
On hearing the news of the accident in the coal mine, she __________ pale.
—Did Jack come back early last night? —Yes. It was not yet eight o'clock __________ he arrived home.
In order to finish the work on time, we can't __________ to waste a single minute.
__________ in her office for nearly 20 hours, she is going home to have a rest.