---My son isn’t good at math. Could you please give him          ?--- Sure.

If my frirends have any problems, my door is ______ open to them.

------________ will you stay there?------For about a month.

The policeman asked the child ________ cross the street ________ the traffic lights turned green.

— I’m sorry, sir. I can’t finish the work on time.— Never mind. ________, the work is quite difficult.