[ Modal Verbs ]
They ___ solve the puzzle after hours of trying.
A. could
B. were able to
C. should

Random Topics:
Modals and ConditionalsAdjectives vs AdverbsQuestion TagsPassive Voice Active VoiceTo infinitive - GerundPast and Present Continuous tenseArticles and PronounsInfinitive and GerundGrammar and EssayPast with ModalsOther quiz:
Modals › ViewThe office workers _____ follow the protocol set in their company whatever the situation is.
A. has to
B. must
C. mustn’t
D. must be
Grammar › View
A child _______ everything he or she wants
A. must be given
B. shouldn’t be given
C. mustn’t be given
D. can be given
Future - Will and Be going to › ViewI………………….to the cinema
A. going to
B. will go
C. go
D. am go
Grammar › View
We __________ (live) in the city, but now we live in the countryside.
A. used to
B. uses to
C. didn’t use to
D. did uses
