She was so sad because she failed in the maths test. Let’s ____ her ____. [ ]

Shall I pay the bill by check?-Sorry, sir. But it is the management rule of our hotel that paymentbe made in cash. [ ]

The population of Liupanshui is over 3 million.

Go and _____ why he did such things.

Mum, why don’t you have the robot ________ housework for you— Oh, it caught a virus, I should have it _________ at once.