The flu is believed __________ by viruses that like to reproduce in the cells inside the human nose and throat.
With a lot of difficulties ___ , they went to the seashore and had a good rest.
The thief , they were happy to shout loudly.
This medicine will him of his cough.
Professor Hawking stepped into the office he knew that there was no hope.
Under a big tree _______, half asleep.