men athletes achieved greatsuccess in the Vancouver Winter Olympic Games.—– Yes. No one could perform _____, Ithink.

The large grassland, reaching out far away, looks extremely beautiful ____the blue and clean sky

You have to take some necessities such as ropes, a flash, boots, ______ you may get lost in the mountain if going hiking

Hobo doesn’t know ____________ .

He is a very hard-working student.— ________. As far as I know, he often burns the midnight oil.