(2013·陕西高考)The children ________ lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.

Betty will ring me up as soon as she ________ in Shanghai.

_____the present unemployment continue,the society would face a more troublesome situation.[ ]

________ rapid economic developmentand political stability over the past three decades, but with them ________some social problems

Use your head,___ you’ll find a good way