Toobtainasatisfactoryresult，onemustapplytwo（）ofpaintonacleansurface.

What a nice day! How about the three of us _____ a walk in the park nearby.

Thethreementriedmanytimestosneakacrosstheborderintotheneighboringcountry_____bythepoliceeachtime.

Mary tiptoed over and took the clock away because she hated to hear it（） when she was trying to go to sleep.

Modern____perhapscausesmoreproblemsthanitsolves.