—Have you been to the Great Wall?
—Perhaps not in my memory; ____, it might have been during the early childhood.
| A．if any | B．if so |
| C．if ever | D．if not |
Dark glasses are sometimes worn to ________ the eyes from strong sunlight .
| A．protest | B．guarantee | C．protect | D．prevent |
“ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” .
| A．explained | B．explain |
| C．explaining | D．having explained |
The detective, ________ to read a newspaper, glanced at the man ________ next to a woman.
| A．pretending; seat | B．pretended; seated |
| C．pretended; seat | D．pretending; seated |
——They say that my new car is a ____________ of money.
——Don’t you think those words are just sour grapes?
| A．lack | B．waste | C．question | D．load |
.——What do you think of ________ lecture given by Professor Thomas?
——Great. I quite agree to his idea that every one can make ______ difference to society.
| A．the, a | B．a, a | C．the, the | D．a, the |