The bad weather made ____ difficult for the birds ______.
| A．it; migrate | B．that; migrate | C．that; immigrate | D．it; to migrate |
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____ the morning of my mother’s birthday, I usually help my mother do some housework.
| A．In | B．At | C．During | D．On |
----What’s that building made of?
----____________, I think.
| A．Marble and stone | B．It has a garage |
| C．Very beautiful | D．It’s kind of modern |
. If I had got back 5 minutes earlier, I _________ him.
| A．would see | B．would have seen | C．will have seen | D．had seen |
With the rapid growth of Cyberspace, everyone should be encouraged to use ______ Internet as ______ tool, making it a trend to study in virtual schools in the future.
| A．不填；a | B．不填; the | C．the; the | D．the; a |
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