---This passage is difficult for me. Could you please explain it to me?---I’m afraid I have to say sorry, but the book is ________ my understanding.
Studying Tom’s menu, I found that many of the items are similar to ________ of McDonald’s.
People who do not smoke have less ______of suffering from lung cancer than those who do so.
This factory produced much dirty water, which resulted in a wide _______ of environmental problems.
Please tell me how the accident _______. I am still in the dark.
It is______ of him to set his aim high but do little, so he is always leaving things undone.