In order to help the police ，the witness described what he had seenvery carefully not to ______ any detail.

26.If you want to succeed ,you must work hard and ____you should be sure of success

It is ______ of a problem to be poor thanto be dishonest.

Don’t skate on the lake! —Why not Isn’t it thick enough___________

The man jumped into the river quickly and the main reason was ____ his drowning son.