3 Write the correct preposition. in at on

Prepositions of Time:

Fill in the blanks with the correct preposition: 'in', 'at', or 'on'.

in

• ___ seven o'clock
• ___ Saturday
• ___ night
• ___ 2009
• ___ summer

at

• ___ the morning
• ___ Sunday morning
• ___ July
• ___ the weekend
• ___ the twentieth century

on

• ... (This section appears incomplete or mislabeled in the source image, as 'on' is typically used for days and dates, which are not listed in the blanks provided for 'in' and 'at'.)

Corrected Prepositions based on standard usage:

• at seven o'clock
• on Saturday
• at night
• in 2009
• in summer
• in the morning
• on Sunday morning
• in July
• at the weekend
• in the twentieth century

Note: The placement of 'in' and 'at' in the provided example is unusual. The corrected version follows standard English preposition usage for time expressions.