Where did you see him for the first time?– It was in the factory _________ we worked.

The house ____ Lu xun used to live in is now a museum.

________ animals are in danger and there will be ________ space for them if we don’t take any actions.

Jack, when shall we go to visit Mr. Smith? – It’s up to him. We’ll go to see him whenever _______.

do you go to the cinema ?—–once a month.