Just a minute.I’ll look up the meaning of the phrase in the dictionary_______

下列各句中没有语病的一项是（ ）

Do you like our English teacher —Yes. I think his class is very ________.

ccessful candidate will be adaptable, take ownership of and develop in the role by taking initiative, being motivated and ________ high standards.

It’s absolutely unacceptable to sacrifice people’s life and health________ the economic developmentin any case.[ ]