Jane， I saw your mother yesterday．
It _________be her． She is working abroad．（ ）
| A． |
mustn't |
B． |
can't |
C． |
shouldn't |
D． |
couldn't |
﹣﹣﹣How wonderful the school concert is!I wonder________ our school will hold it next year.
﹣﹣﹣Sure.It's our school tradition!（ ）
A．howB．ifC．where
Zhang Hong，a Chinese，is the first Asian blind climber_________ has reached the top of Qomolangma.（ ）
A．whoB．whoseC．which
The Party's 100th birthday ____________ on July 1st this year in our country.（ ）
A．will be celebratedB．has been celebrated
C．will celebrate
Life__________ be easy or difficult，sometimes it depends on how you look at it.（ ）
A．can'tB．mustC．can
Everyone needs to know __________ importance of rubbish sorting（分类）.（ ）
A．anB．不填C．the