They in love each other five years ago.
Not having promoted the new digital camera successfully, the company should ______ its original marketing methods.
Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.
Was it not until you began to write ______ you should have remembered more words?
In his lecture, the professor referred to the belief, in contrast to all other countries, ______ the elderly are wise, ______ is particularly dominant (占优势的) in the Chinese culture.
--- I saw your uncle take a taxi to the airport. Why didn’t you drive him there? --- I ______. But my car ______.