[ Present Forms and Narrative Tenses ]
He was about to pay when he realised he _______(forget) to take his wallet when he had left the house.
A. forgot
B. was forgetting
C. had forgotten

Random Topics:
Modal Verbs for Permission and ObligationConditionals 1,2,3Conditionals Type IAdverbial Clause of MannerAction vs Linking Verbs/ Verb PhrasesModal, Causative Verb & Elliptical StructureSubject Verb Agreement and Verb TensesVocab and GrammarGrammar (want to/ need to/ have to)Passive SentencesOther quiz:
Modal Verbs › ViewWhich of the following is correct for expressing uncertainty in the future?
A. She must leave now.
B. He might call you later.
C. They will be here on time.
D. I can finish this task today.
E. You should go there immediately.
Tenses › View
I ___ an exercise now but I ___ it in some minutes.
A. write / finished
B. writes / will finish
C. wrote / is finishing
D. am writing / shall finish
E. have written / had finished