We are all concerned _______ her safety.

I was really anxious about you. You ______ home without a word.

Very few people understood this contract, ______ was very obscure.

Sickness often _______ eating too much.

Look at this group of people ______ beach volleyball.

If you are too ________ of your children, they will never learn to deal with difficulties in life.

The professor asked a question, and David ________ a good answer.

He would have given you more help, if he ________ so busy.

After months of voyage, Columbus arrived in ______ later proved to be a new continent.

It rained hard yesterday, ______ prevented me from going to the park.