______ is this? Is it a ruler?—Yes, it is a red ruler.

Only when ____in the afternoon _____able to leave.

Xiao Shenyang says that _________ job is to make people happy.

Mr.Green____gotobed____hefinishedhisworklastnight. [ ]

Do you know when your friend ___? –I’m not sure. I will tell you when he _____?