Mr. Smith gradually _____ a knowledge of the subject.
| A．attained | B．achieved | C．required | D．acquired |
After the earthquake, the government turned a school into a for the victims of the earthquake.
| A．cover | B．house | C．shelter | D．ruin |
It is difficult for my teacher to my mistakes in my composition. He is so careful!
| A．notice | B．realize | C．ignore | D．memorize |
I have many friends,some are businessmen.
| A．of them | B．from which | C．who of | D．of whom |
He used to ______ cards, but now he is used to _______ a walk after supper.
| A．play; taking | B．playing; take | C．play; take | D．playing; taking |
He is considered ___________ the work ahead of time.
| A．finishing | B．to finish | C．having finished | D．to have finished |