[ Gerund ]
This morning, i spent 30 minutes….. this document.
A. to check
B. checking

Random Topics:
First Conditional SentenceIrregular Plural NounsModals and Comparative SuperlativeAdverbs (manners & modifiers)Conjunctives-ing / InfinitiveGrammar - Punctuation of SentencesThe First Conditional SentenceVerb Tenses and ModalsCountable and UncountableOther quiz:
Phrasal verbs and Prepositional Phrases › Viewknow sth by watching the news
A. hang up
B. on the news
C. log off
Future Tenses › View
I promise I ____ for the test this afternoon.
A. am studying
B. will study
C. am going to study