شرکت در آزمون آنلاین
زبان انگلیسی 1
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درس 3
| آزمون شماره 11135
I hope this book will be of ....................... to both teachers and students.
.Providing homeless people with somewhere to stay when the weather is cold only skates round the problem , it doesn't .................................... it
Nowadays , our young scientists take great positions in the most famous universities and companies because of their ................................... on Nano materials.
