To live on Mars, you need to wear boots which ________ to prevent you from floating off into space.
— I left my keys in the room yesterday. I had to get in ________ the window. — It’s dangerous to do that.
— Has Donnie finished reading the novel? — Not yet. There ________ still ________ of it left.
The tourists will find the guide book is of even ________ practical value than they thought, as it shows different routes to the places they are going to.
— Do not give up! Perhaps ________ tough task needs more of your effort. — I won’t. I’ll have ________ second try anyway.
He spends as much time as he can ____ English every day.