The rumor was false; ___ fact, no meeting had even been planned. A. on B. at C. in D. by Explanation: The idiom is in fact when adding the true situation.
___ first, the software seemed confusing. A. At B. In C. On D. By Explanation: The idiom is at first for the beginning stage.
The guide explained the route ___ detail. A. in B. on C. with D. by Explanation: The idiom is explained in detail for a full, careful explanation.
He learned the speech ___ heart before the ceremony. A. by B. off C. in D. with Explanation: The idiom is by heart for memorizing completely.
The final copy was written ___ hand, not typed. A. by B. in C. on D. with Explanation: The idiom "by hand" means doing something manually.
I deleted the wrong file ___ accident. A. by B. on C. in D. at Explanation: The idiom is by accident for something unintended.
The doctor said he wanted to see her ___ once. A. at B. in C. on D. by Explanation: The idiom is "at once," meaning "immediately."
Please book your tickets ___ advance. A. in B. on C. by D. at Explanation: The idiom is in advance for something done beforehand.
She didn't break the vase ___ purpose. A. on B. by C. for D. with Explanation: The idiom is on purpose for something intentional.
I met my old teacher ___ chance at the bookstore. A. by B. on C. in D. with Explanation: The idiom is by chance for something unplanned.