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Practice 1 (Present perfect)
She __________ her English homework, so she's watching TV in her room.
They __________ a battery that lasts longer than a full week yet.
__________ scientists __________ any new elements on other planets in recent years?
We __________ this powerful antivirus software since the beginning of last year.
The software __________ at all this month, which is surprisingly good news.
How long __________ the developers __________ the security of this new messaging app?
The school __________ a community clean-up event twice this semester.
The committee __________ the important contract document so far this afternoon.
__________ you ever __________ your passport while travelling alone in a foreign country?
She __________ to the university's large science laboratory since last term ended.
The company hasn't made a better version since it has released the first model in 2018.
The children ate all the fresh fruit, so there is nothing left for dessert.
Researchers have developed the internet in the 1960s, but technology has changed a lot since then.
Why did the project fail, and what improvements did they make since then?
Engineers designed that robot five years ago, and they updated it three times since.
It / be / first time / my brother / build / drone / completely / himself.
the government / offer / any financial help / small businesses / so far?
How many inventions / that brilliant engineer / patent / the year 2010?
She / use / 3D printer / many times / since / she / buy / it last summer.
Our city / become / much safer / quieter / the past decade.
Rewrite the sentence and keep it the same meaning as the first one. No more than SIX WORDS in the blank.
I have never tried wearing a smartwatch that measures my heart rate. (tried)
→ It's the first time that measures my heart rate.
Rewrite the sentence and keep it the same meaning as the first one. No more than SIX WORDS in the blank.
The engineers have not updated the software on those machines for many weeks. (last)
→ It's been many weeks the software on those machines.
Rewrite the sentence and keep it the same meaning as the first one. No more than SIX WORDS in the blank.
Scientists have not tested that space robot in the desert for almost a year. (last)
→ Scientists the desert almost a year ago.
Rewrite the sentence and keep it the same meaning as the first one. No more than SIX WORDS in the blank.
Scientists have not published a report about climate change for five months. (last)
→ The about climate change was five months ago.
Rewrite the sentence and keep it the same meaning as the first one. No more than SIX WORDS in the blank.
When did your friend start using that new app for designing small inventions? (How)
→ that new app for designing small inventions?
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