30.They are letting us use their computer, and __________ we are giving them the results of our research.
A. in charge B. in place C. in return D. in a row
29.There was a murder in one of the poorest suburbs in the city the other day. Now the police are turning the whole house upside down __________ of clues.
A. in want of B. in search of C. in favor of D. in memory of
28.The local government has been accused of not responding __________ to the needs of the homeless in the flood-stricken area.
A. hopelessly B. appropriately C. needlessly D. constantly
27.There is no doubt that as we get older, our bodies become less __________ at burning calories.
A. energetic B. effective C. abundant D. efficient