.-Is there any flight to Tokyo today?-I think there ______, for the weather is too bad.
As I have no computer,I have to come to the only Internet cafe in the town to _______ my email.
The students in the university are all taking courses _______ a degree.
One of the best ways for people to keep fit is to _______ healthy eating habits.
I couldn’t _______.The line was busy.
It’s ten years since the scientist _______ on his life’s work of discovering the valuable chemical.