1 . You don’t have to take notes ________ I tell you to do so.
| A．if | B．when | C．because | D．unless |
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2 . It was quite some time I managed to catch the drift of what she said.
| A．when | B．before | C．until | D．since |
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3 . That is ______ many experts (专家) are worrying about.
| A．what | B．why | C．whom | D．which |
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4 . You will be late _________ you leave at once.
| A．if | B．or | C．until | D．unless |
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5 . You’ll speak English well ______ you keep practicing.
| A．though | B．while | C．if | D．before |
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6 . I’d like to attend the conference in Baltimore ________ that I can meet with some of our competitors face to face.
| A．so | B．or | C．but | D．and |
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7 . The birds flew away ________all directions ________they caught sight of a man coming near.
| A．to; the instant | B．from; the second | C．in; immediately | D．towards; the moment |
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8 . ________ it is learning in school through computer, relaxing at home with video games and TV or communicating with friends on phones and social media, time spent on screens has become an essential part of modern life.
| A．Because | B．While | C．Whether | D．As |
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9 . Tom won’t apologize to us ______ he has realized that he is wrong.
| A．as if | B．even though | C．ever since | D．in case |
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10 . It is essential to know about the corporate identity of the company you are applying to ______ the interview takes place.
| A．unless | B．while | C．until | D．before |
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