[ Grammar & Vocabulary ]
It is difficult ____ rules that tell exactly when you should apologize.
A. writing
B. to write
C. write
D. wrote

Random Topics:
Irregular verbsIntermediate PrepositionsAdverbs, Modals, Preposition of timeVocabulary and TensesPresent Perfect: for/sincePossessive Adjectives & Possessive PronounsPhrasal Verb & Prepositional PhraseFuture or PastArticles and PronounsComparative AdverbOther quiz:
Grammar › ViewI am going shopping for food this evening _________ I do not have to go at the weekend.
A. since
B. although
C. so that
D. though
Subject-Verb Agreement › View
We can _____ our food here.
A. ate
B. eats
C. eating
D. eat
Preposition of Time › Viewwill graduate from secondary school _______ 2015.
A. at
B. in
C. on
D. from
Demonstrative Pronouns and Verb Tenses › View
The children ____ in the park.
A. are play
B. are playing
C. play
D. is playing