The discovery of the new drug is of great ____ to people who suffer from heart problems.

(2013 ·甘肃兰州名校高三检测)The newcomer is quite ________ to office work.Why not offer her some practical tips?

I saw Bob play the piano at John's party and on that ________ he was simply brilliant.

His aunt’s letters ________ memories of those beautiful days when they used to live together in his hometown. 

On seeing her new classmate，she ________ and said with a smile，“Glad to meet you.”