[ Grammar ]
The scientists ____________ the cause of the problem. (not/understand)
A. not under stand
B. do not understand
Random Topics:
Comparatives - SuperlativeGrammar - ConnectorsNarrative Tenses & ConditionalsModals for Ability, Possibility and PermissionHas and HaveQuestion tag and + - AgreementIntensifiers: Really vs Very-ed or -ingBecause / soModals for ObligationOther quiz:
Past Simple › ViewStop
A. Stoped
B. Stopped
C. Stop
Grammar › View
Terry thinks that physics
A. are difficult
B. has difficulty
C. is difficult
D. can have difficulty
Infinitive › ViewDo you want___________ basketball?
A. to play
B. play
Modals › View
____ you help me carry these boxes?
A. Can
B. Should
C. Might
D. Must