____ sat down for a rest the door bell rang.
No one had told Smith about __________ a lecture the following day.
If the food tastes nice, we will buy some; if ________, ________.
The man was charged ____________ the crime of betraying his country and sentenced ________ ten years in prison.
With the popularity of the Internet banking, it is becoming more convenient to ________ a business credit card for personal use online.
The guy felt dizzy and sick because of mild ____ shock. He was saved by an ______ engineer.