глаголы в скобках поставить в подходящую временную форму Past Simple либо

Глаголы в скобках поставить в подходящую временную форму Past Simple либо 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.