There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
A．since B．if C．as D．while
India attained ________ independence in 1947, after _______ long struggle.
A．不填; a B．the; a C．an; 不填 D．an; the
At the last moment, Tom decided to ________ a new character to make the story seem more likely.
A．put up B．put in C．put on D．put off
The door ________ open, no matter how hard she pushed.
A．shouldn’t B．couldn’t C．wouldn’t D．mightn’t
The drive wanted to park his car near the roadside but was asked by the police ________ .
A．not to do B．not to C．not do D．do not
When I first met Bryan I didn’t like him, but I ________ my mind.
A．have changed B．change C．had changed D．would change
