6．Don't come into the lab you are asked to．( )A．unlessB．untilC．becauseD．since——青夏教育精英家教网——

6．Don't come into the lab ________ you are asked to．（　　）

5．-Why didn't you answer my phone call，Jack？
-I'm sorry，but I ________ then．（　　）

4．My twin brothers promised my parents to give up playing computer games，but ________ of them made it．（　　）

3．--Do you know why he didn't ____ a word when he ____ to？
--Because he was too nervous．（　　）

say，was spoken

speak，is spoken

2．--Could you tell me ____？
--At the end of July．（　　）

	A．	how often he heard from his pen pal
	B．	how soon he will be here
	C．	that he went on vacation
	D．	when you will start your vacation

1．I don't have a present for my friend．What if ____ else brings a present？（　　）

20．The song reminds me of my old school days as soon as it ____．（　　）

19．She said she returned the book to the library．I'm sure she ____．（　　）

18．If you have trouble pronouncing these words，you can repeat them over and over again ____ you are comfortable with them．（　　）

17．I still remember my first teacher ____ we haven't seen each other for many years．（　　）

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