根据句意及首字母提示补全单词．

Many sharks f ________ on fish, other animals and so on．

The line of people there is ________(end)and he won’t wait any longer．

We should keep the ________(平衡)of the nature．

The woman is feeling a little ________(焦虑不安的)．

His English teacher tries his best to make them ________(interest)in his class．

My parents often tell me to spend less time ________(chat)with friends online．

Can you offer him some useful ________(suggest)?

Nobody told us when ________(leave)．

To work hard brings you ________(succeed)．

He is far too busy ________(finish)his paper．