One of the Chinese festivals _________the Dragon Boat Festival.

f a treatment ________ delayed the disease by seven years were to be available, the number of sufferers would drop by 40% by the middle of the century.

Many people_________watching football games.

We are happy to know that our head teacher will be _____ to headmaster.

gh cats can not see in completedarkness, their eyes are much more ______ to light than human eyes.