Standing on the top of the hill, one would not do anything, but _____ the flowing of the clouds around me.
As is reported, it is 100 years________ Qinghua University was founded.
—What a mistake!—Yes. I________his doing it another way, but without success.
________students are required to take part in the boat race.
The dog was approaching ________the garden when she ran out.
They have________signs in some places to remind (提醒)the visitors not to step on the grass.