The boy's bad behavior ____ his mother lots of sleepless nights.
Einstein liked Bose’s paper so much that he ________ his own work and translated it into German.
Giving up my job to go back to full-time education was a big __________, but now I know it was the best decision I ever made.
The new tax would force companies to __________energy-saving measures.
But for water,it ______ possible to live in the desert.
I like __________in the early morning when the air is fresh and I can take a walk around the garden.