Teenagers would rather ________ phone calls while businessmen prefer ________ emails to communicate with each other.
The flight to London wasbecause of the heavy snow.
Tom is weak in physics. He always feels _______ before he takes a physics test.
Ann is a careful girl. She always goes over her exercises to____ there are no mistakes.
To be healthy, one must have at least _____ sleep every day.
There are forty students in Class Four. And of them girls.