He started to learn English in 1990 and in the years ________ he kept on using it in his work.
—Would you mind my _______ your speech?—Not at all. Go ahead.
The ability ________ an idea is as important as the idea itself.
We were just about ready to leave _____ it started to snow.
It’s a mistake to think of Chongqing only ______ its tourist attractions.
Is this the young engineer ________ you want to have ________ the computer for me?