Nick's homework three hours ago.b) did a) made 2. we research at the moment. a) making b) doing 3. i m afraid i' mistake in the calculation a) made b) done 4. he is working on an nano-technology b) research a) investigation 5, for the detection of the killer will continue. a) investigation b) research

marichkakyhar    1   24.07.2019 17:20    0