Do you know whose book it is？
Oh． It ______ be Lucy's． Look， her name is on it．（ ）
| A． |
can't |
B． |
must |
C． |
shouldn't |
Her parents bought a new car for ______．（ ）
| A． |
themselves |
B． |
herself |
C． |
themselfes |
The computer is one of the most important ______．（ ）
| A． |
inventor |
B． |
inventions |
C． |
invention |
______ book on the desk is ______ useful one．（ ）
| A． |
The； an |
B． |
A； an |
C． |
The； a |
How about buying an iPhone 6s for your birthday？
Oh，maybe it's too expensive，Dad，Do you know？（ ）
| A． |
how much it costs |
| B． |
how much does it cost |
| C． |
how much it cost |