When first ________ to the market, the computer software . was not a success due to its complexity in operation.
- Do you mind my opening the window? -______I feel a bit cold.
Father said he would come to my graduation ceremony, he didn't, _______.
Be _____we can' t expect an absolute freedom of expression.
Sometimes people just believe what they see, ______the reality may be different.
- The speaker is a tall man with glasses. - Then it_____ be Mr. Smith, who is short and thin.