Studies have long shown that our heart rates and anxiety levels rise and fall ______ on the speeds of the music we hear.
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.