The terrorists might have planted a bomb on a plane in Athens, set to________when it arrived in NewYork.[ ]

They lost their way in the forest, and _______ made matters worse was that night began to fall.

you please put two pieces of turkey on the bread–Sorry, I can’t do it.

Lily is so kind-hearted a girl that she often gives__________ needs her help

The course normally attracts 20 students per year, ____ up to half will be from overseas.