______ at the door before you enter my room, please.
Evelyn is supposed to attend church soon, but nobody is sure whether she or not.
—Pick, I did very well in the maths exam last week.—Congratulations, Jim! And I did _____. I got a full mark and 20 extra points.
The college education system should be reformed ______ it can follow the pace of the economic development.
Researchers now have some proofs ______ reading the Roman alphabets and Chinese characters uses different parts of brain.
He _____ his potential had it not been for his desire to meet new challenges.