As we all know, an island is a piece of land ________ by water.
| A．surround | B．surrounding | C．surrounded | D．to be surrounded |
Stephen Hawking believes that the earth is unlikelyto be the only planet __________ life has developedgradually.
| A．that | B．where | C．which | D．whose |
The newly-built cafe, the walls of __________ arepainted light green, is really a peaceful place for us, especially after hard work.
| A．that | B．it | C．what | D．which |
I have reached a point in my life __________ I am sup-posed to make decisions of my own.
| A．which | B．where | C．how | D．why |
Everyone has periods in their lives __________ everything seems very hard.
| A．when | B．where | C．which | D．that |
Gun control is a subject __________ Americans haveargued for a long time.
| A．of which | B．with which | C．about which | D．into which |