The girl has to her grandma because her parents are working in another city．（ ）
A．look atB．look into
C．look throughD．look after
Is the woman Miss Zhao？
It ______ be her．She has gone to Qingdao for a meeting．（ ）
| A． |
can't |
B． |
needn't |
C． |
must |
D． |
may |
New energy cars have been ______ to cut down air pollution．（ ）
| A． |
discovered |
B． |
found |
C． |
invented |
D． |
refused |
He tried many ways to solve the problem．But ______ of them worked．（ ）
| A． |
neither |
B． |
none |
C． |
all |
D． |
both |
We are going to have a party ______ the evening of June 30th．（ ）
| A． |
on |
B． |
in |
C． |
at |
D． |
for |
I'm sorry I took your card by mistake，but where is ______？（ ）
| A． |
hers |
B． |
theirs |
C． |
yours |
D． |
mine |