Complete each of the sentences with one appropriate preposition. (Điền giới từ thích hợp, cả nhà ơi giúp e nhé, plz)

  1. The students were asked to provide reading and writing skills_______the villagers.
  2. More and more people are taking part ___________ the struggle against illiteracy.
  3. Let's concentrate _________ solving this problem before we discuss the other ones.
  4. William insists ___________ getting up early, even on weekends.
  5. Many companies participated ___________ the trade fair.
  6. Many students have difficulty ___________ learning phrasal verbs.

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