Mario，your mobile phone is ringing．
Wait a minute．It's dangerous for us ______it while crossing the street．（ ）
| A． |
answering |
B． |
to answer |
C． |
answer |
D． |
answered |
Can you tell me ________？
I remember it was on March 2．（ ）
| A． |
how you returned the books |
| B． |
why you bought so many books |
| C． |
when you returned the books |
| D． |
where you bought so many books |
Bijie is______the northwest of Guizhou．（ ）
| A． |
on |
B． |
to |
C． |
in |
D． |
at |
English is as_______as Chinese．（ ）
| A． |
interesting |
B． |
more interesting |
| C． |
more interested |
D． |
interested |
We will go for a picnic_______it is sunny tomorrow．（ ）
| A． |
when |
B． |
whether |
C． |
if |
D． |
while |
The mobile phone in 1973．（ ）
| A． |
invents |
B． |
is invented |
| C． |
invented |
D． |
was invented |