13．The incomes of male workers went up by almost 80%．______，part-time women workers saw their earnings fall．（ ）
| A． | Meanwhile | B． | Therefore | C． | Moreover | D． | Otherwise |
12．Though Betty doesn't like her present job，she wants to ________ it until she gets another one．（ ）
| A． | hang up to | B． | hang on to | C． | hang off to | D． | hang back to |
11．John makes up his mind to get a seat for the football match _________ it means standing in a queue all night．（ ）
| A． | as if | B． | ever since | C． | even if | D． | only if |
9．Anything special about this device？
Well，it can ______ between the cancerous and the normal cells under certain conditions．（ ）
Well，it can ______ between the cancerous and the normal cells under certain conditions．（ ）
| A． | conclude | B． | exclude | C． | discriminate | D． | undergo |
8．-Hurry!There's no time to waste．
-OK．But I'm afraid that ______ I work around the clock，I can't catch up with those straight A students．（ ）
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-OK．But I'm afraid that ______ I work around the clock，I can't catch up with those straight A students．（ ）
| A． | even if | B． | as | C． | until | D． | as though |
