Have you sent thank-you notes to the relatives from _ _ you received gifts?
For sustainable development, the government has decided to give __________ to those energy-conserving and environment-friendly businesses in many aspects.
---How do you like the food and service in our canteen?---Much better than ______ used to be.
—The boy’s father failed to find a job. ______. He got a cancer.—How sad! We should give him a hand.
It’s unwise of you to consider his wild behavior as ______ a kid’s game. It may gradually develop into a bad habit.
these trials, people are ________assigned to a "treatment" group, which benefits from the project, and a "control" group, which does not.