A girl calling herself Mary is waiting outside; _____ she come in now?

—Have you checked the engine? —Yes, I did twice; there ______ be anything wrong with the car.

Passengers _____ fasten their seat belts immediately after taking their seats. The belts should remain buckled during the flight whether or not the “fasten seat belt” light is on.

The doctors are doing all that they _____, but the old man is still not breathing properly.

 I felt surprised that anyone of his intelligence   ________  such an easy test.