—Can I help you with it?— I appreciate your _____, but I can manage it myself．

Pine trees, of which there are almost one hundred ____, are found throughout the North Temperate Zone.

At last, I should thank Mr. White for the _______ of speaking here and for ensuring me such an attentive audience. 

o make members of a team perform better, the trainer first of all has to know their ______________ and weaknesses.

I know that our geologists think highly of his researches in the ______