―Look! What a mistake! Why?
―Sorry, I _________ on it．
| A．don’t concentrate | B．hadn’t concentrated |
| C．haven’t been concentrating | D．wasn’t concentrating |
--- You are going to publish my book .Are you serious?
--- _______. It’s to be published next month.
|
--- Were they late for the play?
--- Not really. As soon as they ____ themselves in their seats in the theater, the curtain ____.
|
--- It’s a long time ____ I saw you last.
--- Yes, and what a pity. It will be a long time ____ we see each other again.
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In character- training of children, what really ____ much is what their parents say and do.
|
---There must be a dozen pens in this house but I can never find one when I need one.
--- Keep looking. ____ is sure to turn up.
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