North Korea threatens to ________ from six-party talks aimed at ending North Korea's nuclear program unless its proper rights are to be satisfied．
| A．escape | B．flee | C．withdraw | D．retire |
, most teenagers now listen to rock music . However , Jonah prefers classical music .
| A．In a word | B．In general | C．In particular | D．In total |
It rained nonstop for ten days , completely our holiday.
| A．to ruin | B．ruined | C．having ruined | D．ruining |
How come you stepped into the lab with your shoes on ? You’re to take them off before you enter it . I told you so !
| A．expected | B．supposed | C．forbidden | D．permitted |
—Is David a man with good manners ?
—I don’t think so . As a matter of fact , he is but polite .
| A．something | B．everything | C．nothing | D．anything |
—George is a wise person .
—But in my opinion , he is than wise .
| A．cleverer | B．braver | C．more brave | D．less brave |