You praise your son. He works harder than before. —Thanks, I will.

The mountain was_____ steep (陡峭的) _____ few people in our city reached the top.[ ]

This dictionary is_______ to my translation, but that one is________.

I find _______ necessary to take some warm and dry clothes with us during the walk.

He walked _________ fast for us _________ catch up with（赶上）。