Everybody in the little town knew my first teacher, so we had no _____ finding his home.

Your aunt often walks the dog in the morning. —Yeah, ____ bad weather stops her.

Trees are very important to our environment. They can _____ wind from blowing the earth away.

The little boy decided to turn in the wallet and ________.[ ]

The flu is believed _____ by viruses that like to reproduce in the cells inside the human nose and throat.