David, get up early, ________ you’ll catch the earlybus.

_______ surprised me most was ________ sucha little boy of seven could play the violin so well.

When a tomb is opened, fresh air disturbs the viruses If _____, they can result in illness or even death [ ]

Have you worked here since you graduated?—No, I ________ at a factory in Beijing for six years

It shocked me to see ______ my neighbors treated their children