... decrease d. infewness 10. These birds _____ to North Africa in winter.a. settle b. go c. relocate d. migrateIII. GRAMMAR AND STRUCTUREA. Choose the word or phrase - a, b, c or d - that best completes ... secret b. ocean c. migrate d. herbicideII. VOCABULARY AND EXPRESSIONChoose one word phrase - a, b, c or d - that best completes the sentenceor substitutes for the underlined word or phrase.1. ... must have taken c. should take d. had totakeB. Identify the one underlined word or phrase - A, B, C or D - that must bechanged for the sentence to be correct.1. Jack will win the election if...