When you drive home, you can’t be＿＿＿＿＿＿＿careful

He was badly hurt last night. That is _____ he didn’t come to school.

Is there any possibility _____you could pick me up at the airport? — No problem. [ ]

Who was the man talking to ourmanager in the hall yesterday—A man _______ himself a popular singer.

The manager told us that very little _______ was made of waste materials in the past.[ ]