58. By the time the factory was shut down,it (dump) its waste into the lake for years.

57. Wuxi Underground Line 1 (expect) to be in service later this month.

56. — I can’t find the new road on my mobile phone. Are you sure you’ve got the name right?

    —Yes. But you (download) the latest map?

55.  (print) your report out,you only need to click on that icon.

54. —Will you ever leave her alone?

    —Only if she (ask) me to.

53. The officer promised they (keep) searching for the missing plane until it was found.

52.  (compare) with the older model,the new robot costs less but lasts longer.

51. I can,t understand your suggestion. Would you mind explaining it (clear) ?

50. It’s reported that some wild animals (face) the danger of dying out now.

49. Follow that (doctor) advice and you will get better soon.