Prepositional Phrases

Most of my former classmates have become experts ...... IT and telephony over the past seven years.
1. at
2. for
3. about
4. to
Once the trainees have completed the course, they will have become experts ...... composing business English letters and e-mails.
1. in
2. about
3. with
4. for
Would you mind explaining the problem ...... us one more time, Dr Winston?
1. to
2. for
3. about
4. at
It's not a prudent decision to expose young children ...... great violence as it may hurt their feelings.
1. to
2. about
3. for
4. in
The latest exhibition is expressive ...... the artist's dark period. Wouldn't you say so, Freda?
1. of
2. about
3. for
4. at
Pete would have been faithful ...... his sweetheart Lilly for the rest of eternity as he'd never take a single look at another woman. He's madly in love with her and is not interested in anybody else, you see.
1. to
2. about
3. in
4. for
The Prime Minister has proven false ...... his pre-election promises. I'm afraid he hasn't kept a single one of them.
1. to
2. for
3. at
4. about
That picture looks familiar ...... me, but I just can't remember who painted it. Well, it seems to have slipped my mind.
1. to
2. for
3. into
4. about
Ms Roger's students have already become familiar ...... graphic design, so they can move on to some more demanding things.
1. with
2. for
3. at
4. to
The newly appointed director has become famous ...... his witty remarks.
1. for
2. to
3. about
4. at