You are old enough to ________ your own living.[ ]

international market, the price of petroleumhas been falling down, which is now _____ it used to be

I can’t find my purse anywhere. — You _____have lost it while shopping. [ ]

In the continuous high temperature weather,it is not to fit to gather.That is wecancel the discussion

I can’t tell which is better, ________ I am a green hand