Just like weather, life_______ be sunny and beautiful all the time.
Checking your answers before handing in your paper can help you __________ mistakes.
It’s kind __________ Yao Beina to donate her corneas (眼角膜) _________ three people in need.
Many people do not realize the importance of health __________ they have fallen ill.
Robin broke his left leg in the basketball match last week, since then he __________ in bed.
— We must act now because time is __________.— Yes. Let’s start.