Climate change, once just a guess by people, now has become reality.

‍Good habits, once _____, are just as hard to break as bad habits. ‎ A: to establish B: establishing C: established D: establish

The paper is （）ready--it needs to be checked once more. A: after all B: just about C: in fact D: at least

Which sentence is grammatical correct? ( ) A: It takes seventeen trees to produce one ton of junk mail. B: It takes seventeen trees to produce one ton of junk mails. C: Mails are just sent once a day, and there is no delivery on Sundays or holidays. D: The mail is just sent once a day, and there is no delivery on Sundays or holidays.

Just then my father turned to me, ___(庄严的) and ___(热情的). I bought the ___ and ___. For once, my father let me pay.

As the only direct steamer that calls ____ our port once a month has just departed, the goods can only be shipped next month.

The story you have just told() me of an experience I once had. A: informs B: convinces C: reminds D: warns

Will you ____ me ____ please? Just this once, I promise. A: do well B: do tricks C: do housework D: do a favour

The story you have just told us________ me of an experience I once had. A: reminds B: wams C: recalls D: shows

When she heard the shot, she dashed there at once ______ to find a baby elephant shot dead. A: just B: only C: then D: about