If my car ________ more reliable, I would have driven to Lhasa instead of flying last summer.[ ]

can I go out and play with my friends now—No, honey, you can’t _____ you haven’t recovered from the knee injury.

He is an outgoing boy, and can _____ most of the other boys in the class.

Mr Wang, I have trouble ________ the text. —I’m sure you can, butremember ________ it at least three times.

（题文）______ expense, we must take every measure to save the old man’s life.