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一、单项选择 1.We?are?often?told______?at?people?in?trouble. ? A ?not?to?smile? ? ? ? ? B?to?smile? ? ? ? ? C?not?to?laugh? ? ? ? D?to?laugh? 2.what?are?you?going?to?do?this?weekend?? ? I_______?yet.? A ?haven’t?decided? ? ? ? ? ? B?won’t?decide? ? ? C?have?decided? ? ? ? D?didn’t?decide ? 3.No?one?can?be?sure______?in?a?million?years.? A ?what?man?looks?like? ? ? ? ? ? ? B?what?will?man?look?like? ? ? C?man?will?look?like?what? ? ? ? D?what?man?will?look?like? 4.The?sports?meet?will?continue_____?it?rains?this?afternoon.? A ?if? ? ? ? ? ? ? B?since? ? ? ? ? C?as?soon?as? ? ? ? ? ? D?unless 1.We?are?often?told______?at?people?in?trouble. ? A ?not?to?smile? ? ? ? ? B?to?smile? ? ? ? ? C?not?to?laugh? ? ? ? D?to?laugh? 2.what?are?you?going?to?do?this?weekend?? ? I_______?yet.? A ?haven’t?decided?