Anyvisitorstotheproductionfacilitiesmust____asecuritypassfromtheinformationdeskatthefrontentrance.
A、allowHehasmadeanotherwonderfuldiscovery,_____ofgreatimportancetoscience.
Asfarassheisconcerned,onepieceofmusicisverymuchlike
Thelocaltextilemillhas800workers,_____700arewomen.
Edisontestedmorethanonethousandmaterialstoseeiftheycould_____electric;currentandglow.
Theyfulfilledtheplanmuchearlierthanthey_____
