Working hard is not only a_____ of a great success, but is among the essential requirement.
Please don't forget _______to me, will you?
You _________ never play in the street. It's not safe.
Could you make her ________laughing?
--When can I go out to play football, Mum? --Finish your homework first, or I won't let you ________.
We'd better _______on the road. A car may hit us.