شرکت در آزمون آنلاین
انگلیسی 3
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درس اول
| آزمون شماره 749
I thought I knew Jack well, ……… you don’t know a person until you travel with him ……… her.
When you .......... prefixes and suffixes and know what they mean, it will help you work out the meaning of many words you read.
Because of their long life , LEDs don't need to be .................... as often as other light bulbs , if ever.