The earth is often called the ocean planet． Its surface is 70 percent ________． （ ）
| A． |
land |
B． |
plants |
C． |
animals |
D． |
water |
﹣Excuse me，could you tell me ______ in Puxian Theater？（ ）
﹣For ten minutes．
A．how soon will the concert begin
B．how long has the concert been on
C．how long the concert has been on
Susan's mother looks so young．It's hard to imagine she's already in her ______．（
A．sixtyB．sixtiesC．sixtieth
With the development of modern technology，we prefer taking photos with ______ instead of camera．（ ）
A．
B．
C．
﹣I have been to Mars several times．
﹣You ______ be joking．It's impossible．（ ）
A．canB．mayC．must
﹣A Spring Morning is my favorite poem ____ has beautiful words．
﹣I'm fond of it，too．（ ）
A．whoB．whichC．whom