–Did you _____ your sister when you were in Shanghai?--No. But I _____ my uncle’s during my stay there.
His English is improving _______, which makes both his parents and his teacher happy.
As he works in a remote area, he visits his parents only _______ .
Here are the first three books of his poem works, with the fourth one to _____ next month.
_______every member has arrived, let’s set about _____ the plan for the next five years.
His classmates offered him their congratulations ______ his successful performance.