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:
Grammar › ViewI have to go to bed soon, or I’m going to be so sleepy all day tomorrow.
A. This is a simple sentence.
B. This is a compound sentence.
C. This is a complex sentence.
Grammar › View
I don’t think they ________ their holidays by the sea again (to spend)
A. will spend
B. is going to spend
C. will spent
D. am going to spend
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
