They are good friends. _______ is no wonder that they know each other so well.
— Tom, could you give me a hand in the following exam? — ______. Mom won’t allow me to do such crazy things.
Never before______ such a wonderful park, ______ I'd like to pay a visit again.
The manager asked me to______ the report, because he didn't want to speak for a long time at the meeting.
With the word "PM2.5"______ heard and seen in our life, people become more and more concerned about air pollution.
— The deadline is drawing, but I failed to challenge the task a third time. — ______ my brother have a try?