We try to keep _______ electricity supply during the Spring Festival in case we run out. [ ]

What he said made the coach of the team .

Did you know any Chinese before you arrived in Beijing?—Never ________ it, actually．

In this factory, suggestions often have to wait for months before they are fully _____.

The Voice of China has set up a big stage for young people with a talent for music, ________ some of them have stood out among others.