ed to go to dances and parties, _____ hecould have a good time just sitting and watching.

My doctor recommended that I _______ moreexercise

It’s the office! So you _____ know eating is not allowed here. —Oh, sorry.

By no means true that all native speakers of English know their own language very well．

Li Lin hasn’t turned up yet, but he promised to come to the party.— He ______ home. He is a man of keeping his word.