A) i haven't seen gerry for/since a long time. how is he? b) i can't remember how long/when i've had this watch. c) i've written to deborah last week/recently. d) what have you been doing today/yesterday? e) have you eaten italian food before/already? f) i've been living here in/since the end of last year. g) i've been trying to get in touch with david for ages/for the last time.
тут лучше всего подойдет сканирующий микроскоп.