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.

 The buses, most of _________ were already full, were surrounded by an angry crowd.

His pale face suggested he ________ angry and I suggested that he ________ at once.

Come and see me whenever ____ .

Beijing government puts more than 700 million yuan to increase its green space this year; ____________ doubles the money provided last year.