A serious study of physics is impossible ________ some knowledge of mathematics.
The oil must be used up, the light went out.
---Poor Tom! He will have to work all the next month. ---Luckily, the basketball games are held.
I like traveling by sea it is not rough.
For miles around me there is nothing but a desert, without a single plant of tree .
It was easier to move about the fringe of the crowd.