Studies show that people are more to suffer from back problems if they always sit before computer screens for long hours.
you understand this rule, you’ll have no further difficulty.
—My daughter has passed the exam. —Congratulations! She’s really intelligent. — .
Unluckily, my sister had her cellphone ______ in Guangzhou before she could find a job.
No one knows ______effects the GM material might have on the food chain.
With drink and food ____, the prisoner had to walk out of the cave where he was hiding.