Complete The News Headlines | Class 10 Grammar Worksheets

Complete the given news story using appropriate tense forms.

Hints

The present perfect is the most normal tense for giving news of recent events. Do not use the present perfect with past time expressions like yesterday, last week or last year.

Scientists in the US …………….. (create / have created / created / had created) the first evidence that reprogrammed stem cells really ………………… (has / have / had) the potential to cure diseases. They ………………….. (used / have used / use) skin from the tails of sick mice to cure the rodents of sickle cell anaemia. US and Japanese researchers last month ………………. (reported / have reported / had reported) that they ………………… (have / has / had) reprogrammed human skin cells into behaving like embryonic stem cells. But no one …………………. (know / knew / has known) whether those reprogrammed cells could create functioning tissue cells like natural embryonic stem cells can. Now a team of researchers …………………. (used / have used / had used) the new cells to treat mice engineered to have sickle cell anaemia.

Complete the news story worksheet solution

Scientists in the US have created the first evidence that reprogrammed stem cells really have the potential to cure diseases. They used skin from the tails of sick mice to cure the rodents of sickle cell anaemia. US and Japanese researchers last month reported that they had reprogrammed human skin cells into behaving like embryonic stem cells. But no one knew whether those reprogrammed cells could create functioning tissue cells like natural embryonic stem cells can. Now a team of researchers have used the new cells to treat mice engineered to have sickle cell anaemia.