By 1820, there were over sixty steamboats on the Mississippi river, _______ were quite luxurious.
"many of which" = đề cập tới một trong sixty steamboats
The phrase "keeps sellers on their toes" in the passage mostly means "______".
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
__________ John Kennedy was elected president, he was the youngest American President ever.
Long ago, women were_________to vote in political elections.
She asked me______I was looking at.
Regular exercise and good diet will bring______fitness and health.
Supporters of free-market globalization point out that_____________________ .
In spite of her abilities, Laura has been_____________________ overlooked for promotion.
The packages___________________ so that it would be easier to carry them.
______ his brother, Mike is active and friendly.