When I got to the store, “iPhone 6 Plus” had been sold out. The salesmen didn’t know_____________.

A. when were they available（可得的）

B. when will they be available

C. when they would be available

D. when would they be available

There is something wrong with my DVD player. I’ll have it ____________.

A. fixed        B. to fix       C. fixes       D. fixing

The robot _____________ the virus and it was_____________ trouble.

A. caught; too much     B. caught; much too

C. had; too            D. had; a lot

— What rules do I have to keep while working here?

—______________, you must always wear your uniform.

A. By the way         B. From then on

C. Believe it or not    D. First of all

My bedroom is about _____________of the size of yours.

A. three-fourth   B. three-four

C. third-four   D. three-fourths

The air in Beijing is much worse than ____________ in many other cities.

A. this        B. those     C. that      D. these

When you ___________ yourself with others, you miss the wonder of who you are.

A. compare      B. communicate    C. contact      D. connect

He decided to study hard_____________ catch up with others.

A. as a result      B. so that

C. in order that   D. in order to

_______of them can work out the problem, so I have to turn to a third person for help.

A. None       B. Either       C. Both       D. Neither

The robot needs ____________once a month. And we will check it for you for free.

A. to check       B. be checked

C. checking     D. check