I sent ______ e-mail to Amy to say thanks for her help with my study.

The woman wants to find a job _____ ababysitter.[ ]

Have you ever been to Qufu?—Yes. I went there last year. It’s a very _______ place.

The students are busy ________ their homework. [ ]

If he takes on this work, he will have no choice but ______ an even greater challenge.＿