The flu is believed ____by viruses that like to reproduce in the cells inside the human nose and throat.
A knife and a fork _____ on the table. A knife and fork _____ on the table.
. Many a professor _____ looking forward to visiting Germany now. Many scientists _____ studied animals and plants in the last two years.
Either you or he _____ interested in playing chess. _____ you or he fond of music at present?
He is one of the boys who _____ here on time. He is the only one of the boys who _____ here on time.
It depends on _______ he has enough money.