He _____the problem _____in his mind for a whole week before he did anything about it.

A. switched; on        B. kicked; up      C. turned; over         D. took; on

He ____the job well, but he_______so careless.

A. had done;  had been     B. could do;  was

C. could have done;  was    D. hadn’t done;  had been

After he ______ the table，he sat down on the sofa for a rest，waiting for his guests.

A．lay  B．laid  C．put   D．made

His silence suggested that he_______the truth already.

A.should know              B.know                        C.was know            D.had known

She demanded that he _____ the books he borrowed from her.