Now that energy prices are rising so rapidly, further prices are very uncertain, and the risk _____ a new investment depending on them may fail is greater.

              A．that              B．by which             C．at which              D．in that

 I talked to the girl ______car had broken down in front of the shop.

   A. who              B. her              C. whose          D. which

Thousands of African-Americans cheered Obama’s being elected American President in the streets on November 4th 2008, many of ________ even cried with joy.

A. those                       B. them                        C. whom                    D. which

Venus has a dense atmosphere, _____ we know very little.                  

A. its composition                              B. whose composition

C. about which composition                D. about whose composition

Taiwanese pop star Jolin Tsai said she was happy to learn the challenging moves she filmed for her new album Flower Butterfly, _____ soon.

A. who will come out                                       B. which will come out

C. which will be come out                                 D. where she will come out