Police in America have stepped up their search for a fifteen-year-old boy who went _____ three days ago.

下列各句中，划线的实词解释有误的一项是（ ）

What do you think of the music teacher? ——-_____________she is an elegant lady, she can be extremely difficult to work with

The writer found ________ difficult ________ English.

It usually takes about ten minutes_______to school .