、Amy thought it was __________ to read English newspapers every day so she subscribed to(订阅)the 21st Century.
Someone is ringing the doorbell. Go and see ___________.
One ought __________ for what one hasn’t done.
Luckily good things _________ here to save local wildlife.
The earth became so violent that it was not clear_________ the shape would last or not.
__________ she couldn’t understand was _________ fewer and fewer students showed interest in her lessons.