All the club members _______ the floor when they heard someone _______ for help.

David Burt’s dream in China is to go into the west and ______ an early childhood school there.

Emma ，can you introduce _______ to Alice ?I want to meet her .

________ name is Bob and ________ name is Gina.

We must try our best to stop pollution ______ a low-carbon(低碳)life.