Sam is doing some___________ on the ancient Silk Road.
A.operations B.experiments C.research
Nowadays some____________ made in China are both good and cheap, such as Xiaomi mobile phones, Haier fridges and Lenovo computers.
A.tools B.products C.material
We all went swimming______________ Tom，because he was ill at home.
A.with B.besides C.except
I am afraid we can not to take a taxi. Let's go by underground instead.
A.refuse B.afford C.forget
The young writer has written many novels under the name “Hope”.
A.using the name B.that are called C.known for
I surveyed the paper again before I handed it in.
A.looked up B.looked over C.looked for
