Part ⅡLanguage Knowledge（45marke）
Section A （15marks）
Directions: For each of the following unfinished sentences there are four choices marked A,B,C and D．Choose the one that best completes the sentence．
21．How can I help them to understand _____ they won't listen to me?
A．when B．while C．where D．unless
22．Partly_____ about his past love, he buried himself in his work．
A．to have forgot B．having forgot C．to forget D．forgotten
23．They could have escaped from the big fire, but unfortunately, someone ____the door．
A．locked B．have locked C．had locked D．will lock
24．Nowadays almost everyone prefers to use a smart mobile phone _____ functions are more practical．
A．which B．where C．what D．whose
