Stephen Hawking believes that the earth is unlikely to be the only planet _______ life has developed gradually.
The doctor said this new medicine would ________him of his cough last week .
It is said that the book _________ many events that can’t be found in other books.
Their performance was much better than__________.
Please keep the windows closed _____________ it rains.
When I entered the room, the boy wasin the TV series Journey to the West.