Sam is doing some about the ancient Silk Road．（ ）
A．exerciseB．operations
C．researchD．experiments
She has _________ books than you．（ ）
| A． |
many |
B． |
much |
C． |
more |
D． |
most |
This math problem isn't so difficult that I can work it out ________．（ ）
| A． |
easily |
B． |
usefully |
C． |
loudly |
D． |
quietly |
John is _______ American student．（ ）
| A． |
a |
B． |
an |
C． |
the |
D． |
/ |
Please ____ the dog for me while I'm away．（ ）
| A． |
look |
B． |
look after |
C． |
look up |
D． |
look out |
Nick didn't have dinner ________ be finished doing homework．（ ）
| A． |
if |
B． |
when |
C． |
until |
D． |
after |