________you put your heart into your study, you'll feel________in it.
| A．Once; interest |
| B．If; interested |
| C．Since; interested |
| D．When; interesting |
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_________．Only from 8:00 am to 4:00 pm.
| A．That’s all right | B．Yes，of course |
| C．Sorry，I’m not sure | D．Sorry，I’m afraid not． |
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