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－Has he finished the work?

－Not really．________ he worked all day, ________ he couldn't finish the task．

A．Although, yet

B．As, yet

C．Despite, but

D．In spite of

－The weather is changeable here．Please take more clothes．

－________．

A．Well, it depends．

B．It's a pleasure

C．OK, just in case．

D．Take your time．

－Has Li Lei finished his work today?

－I have no idea, but he ________ it when I saw him this morning．

A．had done

B．would do

C．was doing

D．did

－Can I look at the menu for a few more minutes before I order?

－Of course．________ , Sir．

A．Make yourself at home

B．At your service

C．Take your time

D．It doesn't matter

－Jenny took the 9∶10 bus to Hangzhou this morning．

－Really? He ________ the 9∶00 Express．It is much more comfortable and faster to travel by train．

A．could have taken

B．need have taken

C．must have taken

D．would have taken

－Do you have any plans for the weekend?

－Yes．________ , I will go to a suburb of Beijing and attend a toy festival．

A．If ever

B．If busy

C．If any

D．If possible

－Look! The man over there must be our headmaster．

－No, it ________ be him．He has gone to Beijing．

A．mustn't

B．may not

C．shouldn't

D．can't

－Mom, today I received a message telling me to send money to the account．

－Delete it．It's a trick．Many a person ________ by such tricks．

A．have been cheated

B．were cheated

C．has been cheated

D．was cheated

－China is developing rapidly．

－Yes, to make our country more prosperous, we should firmly ________ the principle of scientific development．

A．contribute to

B．subscribe to

C．stick to

D．turn to

－It's necessary to limit the speed of electric bikes．

－Yes, most riders of electric bikes in China ________ 40-50 kilometers per hour often ignore red lights, ________ the risk of traffic accidents．

A．reaching; increase

B．reach; increase

C．to reach; to increase

D．reaching; increasing