Prepositions of time

Complete the sentences  with at, in or on:
He always gets up ______ 7 o'clock

• at 
•  in 
• on 
• under

Can you come to the appointment ________ April 1?

• in
• on
• at
• by

You need to get here ________ the morning.

• in
• on
• at
• by

The office is closed ________ Sunday.

• in
• on
• at
• by

The doctor can see you ________ a week.

• in
• on
• at
• by

You need to call ________ 5 pm because the office closes then.

• in
• on
• at
• by

My football game is ____ Tuesday.

• on
• in
• at

The Beatles were popular ____ the 1960's.

• in
• on
• at

Her birthday was ____ September.

• on
• at
• in

My grandpa was born ____ the 20th century.

• on
• in
• at