Вставьте предлоги at , in , on
1) He is going to telephone ____ 5 o`clock.
2)My birthday is ___ May 21 st
3)It is always cold ___ February
4)My father was there ___ 1945
5)He is going to arrive ___ Monday

1. At  (всегда со временем)2. On (т.к указано число. Без числа - in)3. In (выше писал)4. In (т.к год)5. On (день недели)