_____ you have made a promise, you should carry it out.[ ]

What qualities does a person need to become an astronaut?—He ________be knowledgeable，independent and creative.

I have been appointed as manager of ourcompany, but I am worried about it.— Why worry Increased responsibility can___________ your best qualities.

I am very worried about tomorrow’s math test. I am afraid I can’t pass this time.–___________! I’m sure you’ll be successful.

We the problem for a long time, but we didn’t reach any agreement.