51.  They specialize in the big picture and are no good at details.

52.  This elegant insect is a formidable greenfly guzzler and its larvae are particularly good at exterminating these ubiquitous pests.

53.  This is because it is so good at avoiding runs of mutual recrimination.

54.  When she was at school she was good at art.

55.  When they did, they learned that they were good at buying food and merchandising it in their stores.

56.  You have to be articulate to be good at debating.

57.  You have to give yourself over to football if you want to be good at it.

58.  You need to be good at working alone without constant supervision.