Careful surveys have showed that audience _______ teachers and students are more likely to take seats _______ directed.
--Do you know when the Chinese custom_________ from? --It's hard to say. But its characteristics__________ the Tang Period.
After you have used the dictionary, please just put it back______it belongs.
It is usually not quite cold in this area in March, but sometimes temperature________ be very low.
Their tent,__________ light as a feather, remained firm in the storm last night.
Why haven't you finished your homework yet? You___________ to have finished it by last Sunday.