I am interested in traveling. It is ______ but ______.
When he turned professional at the age of 11,Mike________to become a world champion by his coach and parents.
Although medical science________control over several dangerous diseases,what worries us is that some of them are recurrent.
—What's the party like?—Wonderful.It's years________I enjoyed myself so much.
________a certain doubt among the people as to the practical value of the project.
We ________ contact with each other for years. And last week we ________ contact again.