If you still have a problem,you can ask the police ______help.[ ]

I’m a little weak in Maths. I don’t know how to improve it. — Why not __________ Daniel for help? He’s very good at it.

“Well done, John! Not a single mistake ________ in your exam paper this time!” said the teacher．

How often do you exercise? — ever. Because I am very busy with my work.

It never _____ humans until the mid­