连词和状语从句专项练习（无答案）

连词和状语从句专项练习 (　　)1. ________ you smile at others, they will smile back. A．Before B．When C．Until D．Though (　　)2. You'll do much better in your exam ________ you're more careful with your spelling. A．if B．although C．unless D．whether (　　)3. Be quiet, my kids, ________ you will have to stay outside, because this is a library. A．and B．because C．or D．but (　　)4. I was writing a diary ________my brother was watching TV yesterday evening. A．before B．after C．until D．while (　　)5. Tom knew nothing ________his friend told him. A．because B．until C．since D．if (　　)6. --- Would you like to hang out with me? --- I'd love to, ________ I have to study for the test. A．and B．so C．but D．or (　　)7. --- Will you please give this message to Helen? --- Sure.I'll give it to her ________ she arrives here. A．until B．although C．before D．as soon as (　　)8. --- I'm afraid that I can't do it well. --- You should believe in yourself. You won't know what you can do _______ you try it. A．unt