Preposition of Time

The museum offers free entrance ... the first Sunday of every month.

• at

• on

• in

Answer explanation

"On" is used for specific days, and "the first Sunday" refers to a specific day, so we use "on."

The comet was last visible ... midnight on New Year’s Eve ... 2011.

• on / at

• at / in

• in / on

Answer explanation

We use "at" for specific times of day like "at midnight." "In" is used for years, so we say "in 2011."

The project was completed ... time for the deadline, which was ... December 31st.

• at / on

• in / in

• at / in

Answer explanation

"At" is used for specific moments, like "at time for the deadline." "On" is used for specific dates, like "on December 31st."

My English class is ... 10AM on Monday mornings.

• in

• at

• on

Answer explanation

We use "at" for specific times, so "at 10AM" is correct. The part "on Monday mornings" is an additional phrase that tells us the specific day, but the preposition for the time remains "at."

Let's meet at the restaurant ... 7 PM.

• in

• on

• at

Answer explanation

We use "at" for specific times, such as "at 7 PM."

... the last day of December, we will say goodbye.

• In

• At

• On

Answer explanation

"On" is used for specific days or dates, and "the last day of December" refers to a specific date, so "on" is correct.

We usually celebrate New Year's Day ... January.

• at

• in

• on

Answer explanation

We use "in" for months, so the correct sentence is "We usually celebrate New Year's Day in January." The preposition "in" is used to refer to longer periods of time such as months, years, or seasons.

Lisa is going shopping ... Saturday.

• at

• in

• on

Answer explanation

"On" is used for specific days of the week, so "on Saturday" is correct.

Leonardo DiCaprio started working ... 7 O'clock.

• in

• at

• on

Answer explanation

"At" is used for exact times, so "at 7 O'clock" is correct.

Jungkook was born ... the 1st of September.

• on

• in

• at

Answer explanation

We use "on" for specific dates, so "on the 1st of September" is correct.