Hiking by oneself can be _______ and good for health. It may also be good for_______ training.

There is no _______in looking further into this case, I think.

The _______ of large supermarkets, such as Lianhua Supermarkets, has sounded the death knell（钟）of the local shops.

—Does it make any   when to start?—Yes, It matters a great deal. 

—Why is Peter working so hard these days?.—The _______ of failing the exam next week makes him do so.