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When the fat pig broken in, we all ____ our work in surprise.

A.stopped to do B. stopped doing C. continued with D. continued to do

 An acid solution is ____ when it has very much acid in it. 

A.concentrated            B. focused                  C. taken in                  D. expanded

____ late in the afternoon, Bob turned off the alarm.

A.To sleep B. Sleeping C. Sleep D. Having slept

After he failed the exam, he tried his best to ____ and then made a proper plan.

A.gather his thoughts B. collect his ideas C. use his thoughts D. collect his thoughts

 She carefully ____ the letters and put them in order. 

A.gathered                  B. collected                 C. accumulated            D. touched

 I'm afraid I must ____ this conversation.  I have to go now. 

A. break up                 B. break away                    C. break through          D. break

Tom ____ his father to agree to their plan about their wedding. They will celebrate the wedding in a church.

A.tried to persuade B. talked C. tried to talk D. persuaded

 He has ____ to behave better henceforth.

A.allowed                    B. promised                 C. admitted                 D. permitted

He couldn't ____ an answer when I asked him why he was late.

A.come up with B. come up to C. come out with D. come through

 This matter requires our close ____.

A.observe                   B. notice                            C. attention                 D. look