Mr. Smith is in good health now for it is quite a long time since he __________.
A、notsmokedB
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Hisbackacheisonly_________fornotwateringtheflowers.
Onewaytounderstandthousandsofnewwordsistogain__________goodknowledgeofbasicwordformation.
Mary’spronunciationismuchbetterthan__________inherclass.
Johnsaidhewouldpay__________secondvisittoChina__________nextmonth.
Forsomereason,it__________alldayoverthetwoweeks.