The secretary worked late into the night, ______a long speech for the president.
It is usually warm in my hometown in March, but it ________be rather cold sometimes.
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.