_______________ can you get to the airport？
In about 30 minutes． I'm on the way．（ ）
A．How soonB．How longC．How muchD．How often
﹣﹣﹣"Gina，whose book is this？"
﹣﹣﹣ "It ______ be Carla's.Charles Dickens is her favorite writer."（ ）
| A． |
must |
B． |
can |
C． |
may |
Mario and his friends are making some plans _______ in an old people's home this summer.（ ）
| A． |
work |
B． |
working |
C． |
to work |
Abing's Erquan Yingyue is a piece of music ______ has become one of China's national treasures.（ ）
| A． |
who |
B． |
which |
C． |
whose |
﹣﹣﹣"Did you do _________ fun on your vacation，Tara？"
﹣﹣﹣"Yes，I did.I went to Sanya."（ ）
| A． |
everything |
B． |
anything |
C． |
nothing |
While Linda was still sleeping，her mother _______ breakfast in the kitchen.（ ）
| A． |
was making |
B． |
is making |
C． |
has made |