When the sentence "Shall I drive your to the airport first?" is turned into indirect speech, which of the following is most appropriate?

"She must be in the dormitory now." "No, she ______ be there. I saw her in the classroom a minute ago."

It was recommended that passengers ______ smoke during the flight.

The country＇s chief exports are coal, cars and cotton goods, cars ______ the most important of these.

So badly ______ in the car accident that he had to stay in hospital for a few months.

______ regular training in nursing, she could hardly cope with the work at first.

We can assign the task to ______ is capable and trustworthy.

______ your timely advice, I would never have known how to go about the work.

Arriving at the bus stop, ______ waiting there.

A ship with a heavy load of timber is reported to have sunk ______ the coast of California.

______, he would not have recovered so quickly.