Use the suitable preposition of time :
1 I’ll be working ……………7 o’ clock.
2 I’ll be back …………… half an hour.
3 I suddenly felt ill …………… the examination.
4 They were working in the garden ………….. 3 o’clock ………….. seven o’clock.
5 Fatima…………….. got married 1994.
6 The book was easy to read. So I read it………….. a day.
7 They have lived there …………….. 20 years.
8 We were at the party ……………… midnight.
9 They were at school …………… 2 o’ clock.
10 I saw him last ……………… the morning.