Electricity, like other forms of ______, has greatly increased in price in recent years.
I hate _____ when people talk with their mouths full.
Many of them turned a deaf ear to his advice, _______ they knew it to be valuable.
Helen ______ her keys in the office so she had to wait until her husband ______ home.
The teacher, with 6 girls and 8 boys of her class, ______ visiting a museum when the earthquake struck.
With a lot of difficult problems ______, the newly-elected president is having a hard time.