Глаголы в скобках поставить в нужную временную форму past simple или past continuous 1. the steam engine … (to appear) in 1763 2. i (not to go) out last night because it (to rain). 3. mendeleev … (to create) his periodic table in 1871. 4. they (to come) in when i (to have dinner) with my friend. 5. ecological problems … (to appear) in the xx century.

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