When you are in trouble, you may ________ your teacher and classmates for help.

Did you see who the driver was—No, the car ran so fast ____ I couldn’thave a good look at his face.

Simon made a big bamboo box _____the little sick bird till it could fly.[ ]

It was only with the help of the local guide________________.

This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.[ ]