A young man practised ______ English with Mr Green.
You can tell him everything,as he is a man who you can _____ on.
Susan advised me not to buy the vase, but I bought it _____.
The two top students in Mr. Green’s class competed _____ each other for the highest marks.
Everyone has periods in their lives________ everything seems very hard.
—How about camping this weekend,just for a change?—OK,________you want.