___ well prepared you are , you still need a lot of luck in mountain climbing.
—The trip shouldn’t take more than an hour. — ______It is at least two hours.
Can you make sure ______ the gold ring?
It is careless _______ such a mistake.
The teacher said that the sun ________ in the east and ________ in the west.
I’d appreciateif you could turn the radio down. I’m doing my homework.