【题目】If we had taken such effective ________ much earlier, the river would not be polluted so seriously now.

【题目】— Our boss says the company is at _________ crossroads.

【题目】Had it been possible, I would have gone to attend Monica in the hospital, but I _______ fully occupied last month.

【题目】—On Sundays I prefer shutting myself in and listening to music all day on Sundays.

【题目】With two children _____ middle school in the nearby town now, the parents are working hard.

【题目】That company is said ___________ a new kind of robot in their production last year.

【题目】It has been difficult for Tom to since he broke his leg, which causes him to feel cut off from the outside world.

【题目】________ Yao Ming has retired from the NBA, the pleasure we have got by watching him play basketball at home and abroad will last long.

【题目】 You have made a few mistakes in spelling but _______ you have done a good job.

【题目】You can go out, ______ you promise to be back before 10 o’clock.