It is always not easy to live in a foreign country; ____ so if you can’t speak their language.
He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
The police are trying to find out the ____ of the woman murdered in the bathroom.
—Didn’t the guard see him breaking into the bank? —No, he ______ in the other direction.
He said it was this classroom _______ he found his lost watch and _____ he would take good care of it from then on.
With the word “PM2.5” _________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.