It was_______he came backfrom Africa that year_______he met the girl he would like to marry. [ ]

Most probably it will be another 6 hours _____ you can have next meal, so each of you must have your stomach full

gh I majored in English, language _______ becamea challenge when I set foot in the USA for the first time.

I called you this morning, but nobody answered it.— Oh, we ______ some running in the park.

Where did you find the professor who made the speech yesterday？—It was in the hall ______ the students often have a meeting.