John seems happy, even though his wife left him andhe lost his job.— I think he __________ to put on a brave face.

My brother likes to make friends with people who have a positive to life.

________ May as planned at first, the Smiths decided to set out to Hainan at the end of April

This is ______ English book and that is ______ Chinese book.

下列各句中，加横线的成语使用错误的一项是