[ Gerund vs Infinitive ]
We could … sign language to communicate with Betty.
A. to learn
B. learn
C. learning

Random Topics:
Preposition on TimePronunciation and Vocabularyanother/the others/each other/one anotherThird ConditionalsVocabulary and PrepositionsQuantifiers-ed and -ing AdjectivesGRAMMAR - Could / Could notAdverbs or AdjectivesRelative & Interrogative PronounsOther quiz:
Grammar › ViewWhat is the past tense form of smile?
A. will smile
B. smiled
C. is smiling
Vocabulary › View
A collection of facts or information that suggests whether something is true or false.
A. evidence
B. data
C. variable
D. observation