Transplanting organs such as hearts and kidneys has proved easier than transplanting muscles.
has proved sửa thành has been proved
It is stated in the passage that____________________ .
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
Stephanie: "Oh, no! I left my book at home. Can I share yours?" Scott: "______ "
We all agree that she is____________________ student in our class.
He_______________us but he was short of money at the time.
Long ago, women were_________to vote in political elections.
Only one of our gifted students______to participate in the final competition.
I am sorry I have no time at present to____________________ detail of our plan.
The phrase "keeps sellers on their toes" in the passage mostly means "______".
The pool should not be made so deep______small children can be safe there.