What’s the _____ of having a public open space where you can’t eat, drink or even simply hang out for a while?
________ with so much trouble, we failed to complete the task on time.
The reform project _______ by Mr. White ________ at the meeting now.
Who________ for the pollution of our earth?
— So hard ______ in the past few months that he has made great progress in English. — I can see that; only a few mistakes ______ in the exam.
Seeing their son playing computer games all day, the parents don’t know ______ it.