If you do not glue them properly, it leads to the collapse of the tower.

A) No change

B) led

C) may lead

D) have led

Mark slept the entire day; his friend felt that the entire day had been wasted by him.

A) No change

B) he had wasted the enitre day

C) he was wasted the entire day

D) the entire day have been wasted by him.

Though doing Pilates is usually a hobby, Tina felt therapeutic particularly on stressful days it was.

A) No change

B) it has been felt by Tina to be, on particularly stressful days, therapeutic

C) it was felt by Tina to be, on particularly stressful days, therapeutic

D) Tina felt it was therapeutic, particularly on stressful days.

If you were Elsa, then I would be Elf.

A) No change

B) was

C) are

D) I

It is imperative that the Dean are present at the addressing ceremony tonight.

A) No change

B) be

C) was

D) being