Cover of the textbook On Screen B1+ - Student's Book

The key answer of exercise 2

The key to exercise solutions in chapter Language Knowledge 6 for the textbook On Screen B1+ - Student's Book with authors Virginia Evans and Jenny Dooley from Express Publishing

Question

  1. Read the notices. How are they related?
  2. Look at the underlined words in the notices. Which notice A or B best matches the sentence in Ex. 1? Which words helped you decide?

Answer

  1. They both refer to mobile phones.
  2. B - (mustn't, be sure, mobile off)