Which of the following is the main dish people usually have on Thanksgiving Day？（ ）
A．
B．
C．
D．
We don't know ______，but it tells us the importance of friendship．（ ）
A．what the story is about
B．whether the story is true
C．when did the story take place
As one of the most exciting sports，volleyball ______ in the Olympic Games in 1964．（ ）
A．includedB．is included
C．was included
Du Fuguo is a hero ______ is known to millions of Chinese people．（ ）
A．whoB．whichC．what
﹣﹣﹣Look!My mother ______ a new dress for me．
﹣﹣﹣Wow，it looks very nice on you．（ ）
A．is makingB．has madeC．will make
______ it's a public holiday today，some firefighters in our city are still on duty．（ ）
A．AlthoughB．OnceC．If