Jack often plays _____ piano and he wants to be a pianist when he grows up．（ ）
A．aB．anC．/D．the
Excuse me，is there a double room available at the moment？
I am not sure，but just a minute，I it for you．（ ）
| A． |
check |
B． |
was checking |
| C． |
will check |
D． |
have checked |
Ladies and gentlemen，let me，if I ，introduce you my manager，Bill Wealth．（ ）
| A． |
will |
B． |
should |
C． |
must |
D． |
may |
It's amazing! I can't believe you could make it to the top in such a short time!（ ）
| A． |
which |
B． |
what |
C． |
that |
D． |
if |
The dishes in this restaurant must be very expensive．
Don't worry．You can enjoy yourself．It's my ．（ ）
| A． |
time |
B． |
task |
C． |
treat |
D． |
taste |
It's necessary for the phubbers（低头族）to the time they spend on their smart phones．（ ）
| A． |
cut in |
B． |
cut off |
C． |
cut down |
D． |
cut up |