121.2
2 If the sky is clear, you can see the starts at night.
3 After working hard during the day , I like to relax in the evening.
4 Neil Amstrong was the first man to walk on the moon on 21 July 1969.
5 It's difficult to listen if everyone is speaking at the same time.
6 Jazz became popular in the United States in the 1920s.
7 I'm just going out to the shop. I'll be back at about 20 minutes.
8 Can I speak to Dan? I'm afraid he's busy at the moment.
9 Many of Europe's great cathedrals were built in the Middle Ages.
10 Ben is a very fast runner. He can run 100 metres in 11 seconds.
11 Liz works from Monday to Friday. Sometimes she also works on Saturdays.

121.3
3 a Paul got married in April.
4 b They never go out ON Sunday evenings.
5 a We often have a short holiday AT Christmas.
6 a What are you doing AT the weekend?
7 b Will you be here ON Tuesday?
8 b We were ill AT the same time.
9 a Sue got married ON 18 May 2008.
10 b He left school last June.