Fill in the blanks with the words given below.Change the form where necessary.undertakevainprincipleremarkableprofit1.I was grateful to him, and ___from his advice.2.Both sides___ to facilitate further culture exchanges.3.Hehasdisplayed___ courageinhiseffortstoreformtheparty.4.All our efforts were in ___ .5.He is a man of ___ and will never let youdown.