[ Grammar for TOEFL ]
Potassium has a valence of positive one because it usually loses one electron when _____ with other elements.
A. does it combine
B. it combines
C. in combining
D. combination
Random Topics:
Past ParticiplesTenses and VoicePassive SentenceFuture Perfect vs Future ContinuousSuperlativesPassive Voice Present SimpleSimple Future TensePrepositional PhraseVerbs & Phrasal VerbsThere is or There areOther quiz:
Grammar › ViewHe bought a new jacket because his old one ____________ his warm anymore.
A. not keeping
B. were not keeping
C. was not keeping
D. be not keeping
E. was keeping not
Mixed General Quiz › View
The truck will ___ away the bags of leaves.
a. hall
b. haul
Which modal verb is used to express possibility in the present: May or Might?
A. Can
B. Might
C. Would
D. Shall
Simple Present Tense vs Present Continuous Tense › View
(he/eat) rice every day?
A. Does he eat
B. Do he eats
C. Is he eating
D. Are he eating