She wanted to ask if he had news of Williams, but words ________ in her throat.

pleasure   

Susan wanted to be independent of her parents.She tried ________ alone, but she didn't like it and moved back home.

(2013·成都第二次诊断)—Where did you get this book?—I picked it up from a second­hand bookshop if you ________  know.

We can’t _____ other countries in trade if we don’t develop our national economy.