Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
The couple expressed their （ ）thanks to the young man who had saved their son by donating one of his kidneys.(heart,feel)
【正确答案】：HEART-FELT
【题目解析】：
这对夫妇表达了他们衷心的感谢，这个年轻人通过捐赠一个肾脏救了他们的儿子。heart-felt 衷心的。