That was the last time I saw my father before he _____.

---How did it _________ that all the flowers died ?
---I had forgotten to water them.

Everyone was silent as the organizer ________ the result of the speech competition.

After a few courses on painting, Helen said she would ________ oil painting in her spare time.

Most people are familiar with the idea that all matter in the universe ________ atoms.

Reading an English novel last night , I ______ some useful expressions for writing . .

The police ______ his address and phone number in order to do further investigation .

The computer system ____ suddenly while he was searching for information on the Internet.

However, at times this balance in nature is ________ resulting in a number of  possibly unforeseen effects.
A. troubled          B. bothered        C mixed     D. disturbed

It is difficult for us to           conversation with all this noise around us.