شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 13913

I haven’t heard anything from him since then. I ………. what he’s up to.

Nowadays , our young scientists take great positions in the most famous universities and companies because of their ................................... on Nano materials.

According to the passage, spiders are ... .