_____ a final conclusion about the effect of exercise on our feeling of happiness, we still need to conduct more careful research.
   A) Reach
   B) We reach
   C) By reaching
   D) In order to reach

  He was shaking _____ it was warm.
   A) though
   B) since
   C) because
   D) where

  Mother warned her son _____ the electric wires. They are dangerous.
  A) not touching
  B) to not touch
  C) not to touch
  D) does not touch

  21 .They are going to the photographer's to have their pictures_____
  A) take
  B) took
  C) taken
  D) taking

  My parents are on a trip and I don't know _____ .
   A) when will they arrive
   B) when they will arrive
   C) they will arrive when
   D) will they arrive when

  People should be educated _____ reduce the spread of diseases like HIV/AIDS.
   A) in order that
   B) to
   C) to not
   D) in order to not

  The machines _____ by the Boron Group in Germany.
   A) will manufactured
   B) are manufactured
   C) manufactured
   D) be manufactured

  As he_____ to jump over the rope, he fell and hurt himself.
  A) has run
  B) would run
  C) would be running
  D) was running

  She will ask her sister to _____ her baby until she comes back.
   A) look up
   B) look after
   C) look for
   D) look on

  Do you know that Maria _____ as a computer programmer of the Company?
  A) was inviting
  B) is inviting
  C) has been invited
  D) is going to invite