A proper approach to ________ your learning efficiency is of great significance to every student.
A. improving B. improve C. be improving D. having improved
—Why are you looking so worried?
—I sent an email to my son in America last week, but no reply ________.
A. was received B. had received C. has received D. has been received
When the environmentally friendly cars came onto the market, many people were eager to buy them ________ the price.
A. wherever B. however C. whichever D. whatever
—I believe Tom to be a great businessman like Bill Gates in the future.
—Why do you think so?
—Because he is ________ in business.
A. as hungry as a lion B. as sharp as a spear
C. as busy as a bee D. as sly as a fox
Men will ________ all the natural resources if they continue consuming them like that.
A. run out B. wipe out C. drop out D. hold out
An official said the plan had also taken migrant workers into account, ________ medical care would be provided even if they didn’t have a stable job.
A. for whom B. for which C. with whom D. with which
