It’s not necessary to use examples of how your product is being used and how customers have benefited or will benefit from the product.（)

A. except

B. unless

C. since

D. if

A.Oh, I’m afraid I didn’t do well enough

B.No problem

C.I’m glad I could help

D.It’s not necessary for you to say so

Which of the following is correct？

A．Network prefixes are stored in the router's memory.

B．It's necessary for the routers to keep track of the entire address.

C．Most networks today are based on the OSI-seven-layer model.

D．Routers can't decide to forward datagrams based on the network portion of the IP address.

A．Don't give me the rest

B．It's not necessary to give me the coins

C．Keep the change

D．I give up the pocket money

B、he preserved the general style. and force of the language

C、it wasn’t his duty to count out words to the reader like coins, but rather to pay them out by weight as it were.

D、he aimed at translating sense, not words.

A．Don't give me the rest

B．It's not necessary to give me the coins

C．Keep the change

D．I give up the pocket money

Taxi driver: Here you are, sir. Queens Hotel.

Passenger: How much is it？

Taxi driver: Three dollars and seventy-five cents.

Passenger: Here is four dollars. _____________.

A: It ’s not necessary to give me the coins

B: Don’t giv e me the rest

C: Keep the change

D: I give up the pocket money

Richard：You've given us a wonderful Chinese dinner， Mrs. Liu.

Mrs. Liu：______

A、I'm glad you enjoyed it.

B、Oh，I'm afraid I didn't cook very well.

C、Come again when you are free.

D、It's not necessary for you to say so.

M: Hi, what have you been _____1_____ recently W: Study. You know, the exam is coming in two weeks. M: Exam What exam W: Oh, you don’t know. It’s for a certificate in _____2_____. M: Great. Those skills are necessary and widely used. W: Right. Plus, I want to learn something ______3______ my major. M: That’s good. It’s better to ______4______ ourselves with multiple skills, which are what employers ______5______. W: Agree. That’s why I’ve been teaching myself new things.

A.can be an advantage

B.may limit income

C.isn’t necessary

D.is expensive

-Can you tell us why you think this makes good business sense to you？ -We've been doing quite well on our own and we could probably survive like this for quite a few more years to come, but if we really want to take it to the next level, ____________.

：A the board of directors needn't take the present economic situation into consideration ;

B it's not necessary for us to develop the company any more ;

C we are going to have to consider finding more investors