Complete each sentence with the correct form of the word given in brackets. Then press "Check" to mark your answers.
  1. Keith Folse has observed that second language learners see the (acquire) of vocabulary as their greatest source of problems.
  2. The United Kingdom is a (constitute) monarchy and parliamentary democracy.
  3. Electric eels use their electric sense to 'see' by sending out weak (impulse) which bounce off objects and reveal their location.
  4. When astronauts first shaved in space, their weightless whiskers (float) up to the ceiling of their rocket.
  5. Venice in the seventeenth century (pride) itself on being above the quarrels of its neighbours.
  6. The country is (marshall) its forces along the border, and an invasion seems imminent.
  7. Taking a swim in a cold lake is very (vigor).
  8. We held the birthday party outside, and it was so (wind) that it was difficult to light the candles on the cake.
  9. In Japan, gas cookers are preferred to electric cookers because gas (provide) higher temperatures for frying food.
  10. Your final evaluation total is calculated from your marks on (assign) and tests throughout the session.