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19. In:may,winter,201,the morning,spring,the afternoon
At:seven o'clock,at the weekend,half past four,midnight,quarter to five,midday
On:Wednesday,4th January,Sunday morning,Tuesday evening,5th May
20. 1.I always have a shower in evening.
2.We often go ice-skating in winter.
3.My teacher is never late for class in the morning.
4.My birthday is on 10th January.
5.She never done her homework on the night.
6.I usually take a nap at 2 o'clock in the afternoon.
7.It's 9:00 p.m.That means it's nine in the evening.
8.I maje my bed early on weekdays.