11

 considered , ordinary , deceptive , simultaneously , erupt

 5

 214

 Toefl

 12

 foliage , constrained , dense , fundamental , feasible

 5

 183

 Toefl

 13

 feature , intensify , enhance , era , erode

 5

 118

 Toefl

 14

 pervade , especially , maintain , lading , harsh

 5

 168

 Toefl

 15

 recur , dissimilar , diversity , represent , staple

 5

 177

 Toefl

 16

 myriad , superficial , complex , track , relevant

 5

 193

 Toefl

 17

 critical , decline , judicious , appreciably , viscous

 5

 224

 Toefl

 18

 cohesive , reap , derived , mutation , concomitant

 5

 165

 Toefl

 19

 emit , barrier , offset , sequence , harness

 5

 138

 Toefl

 20

 enlarge , controversial , barter , obliterate , significant

 5

 197

 Toefl