What he said at the meeting referred to_______ he was interested in the project

He is a man of great experience , _______ much can be learned[ ]

Not until recently _______the development of tourist-related activities in the rural areas.

Generally speaking，the limits of a person’s intelligence are fixed at birth，but whether or not he reaches those limits will ________ his environment.

So many problems! I’m tired. —You should try to them by yourself. You are not a child any longer.