6
.The young couple,who returned my lost wallet,left ________ I
could ask for their names.
答案】ꢀbefore
. I'll be out for some time.________ anything important happens,
call me up immediately.
答案】ꢀIn case
.________ you start eating in a healthier way,weight control will
become much easier.
答案】ꢀOnce
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7
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8
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