The _______ work continued for more than a week but there was still no sign of the missing boy.
A、researchB
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Pleasebeserious.Iamnot_______.Youshouldconsideritcarefully
Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.
Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
Whenyoufillintheapplicationform,pleaseuseyour_______addresssothatwecancontactyoueasilylater.
Pine trees are usually believed to _______ cold weather.
