－I’d like to help the homeless people in the earthquake. －You ________ join a volunteer group.

We must be strict ________ ourselves. —I think so.

Last weekend Peter had a great deal of fun with his family________kites in a park

While the government says there is a(n) ________supply of houses，prices of apartments have been going up these years.[ ]

They sometimes go on working ___ the light of the moon