The life of a professional tennis player is tough________ you never seem completely free to do _______ you like — even in theoff-season.

Where’s Jack—He has left a saying that he will be back in a minute.

He spent a lot of time______English.

Humans’ activities have pushed some endangered animals into a situationwe will probably never see them.

.It’s no use trying to______him to give up smoking; he won’t listen.（杭州市)