An animal perfectly in ______ with its environment is a perfect mechanism.
______ one of the most beautiful forms of performance art, ballet is a combination of dance and mime performed to music.
We must push the piano to the corner of the hall to_____________________ our party tonight.
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
I am sorry I have no time at present to____________________ detail of our plan.
Regular exercise and good diet will bring______fitness and health.
Michael looked deeply hurt and surprised when_____________________ .
Standing on the tip of the cape,____________________ .
The boat was sailing north when a terrible storm_____________ .
Stephanie: "Oh, no! I left my book at home. Can I share yours?" Scott: "______ "