.If we ________ earlier, we would have had trouble getting good seats.
—How many practical plans has your deskmate made this week?— . All have turned out disappointing.
Fortunately , the adventurers brought the GPS with themselves, they might have been lost in the desert.
— People should spare no efforts to protect the environment. — ________. Air pollution does harm to our health.
Our responsibility is weightier than ______Mount Tai, and our road ahead is _______ long one.
Never before______ such a wonderful park, ______ I'd like to pay a visit again.