The factory was built in a secret place, around _____ were high mountains.
------What will you do during the coming winter vocation?------ I don’t know, but it’s about time ______ something.
As the crowd rushed towards the gate, several people got______.
_______, he doesn’t study well.
I invited five people to my party. Out of five people, only Tom and Jack can come. ______ people can’ t come.
------I’d like to book a round- trip ticket.------Sorry, sir, but there are no tickets______ at the moment.