The teacher told us that water_________at 100℃ .
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.