Share IELTS Gold: Unit 4 Grammar Focus Practice (Advanced)
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Scientists ______________ several new planets since advanced telescopes became available in the 1990s. (discover)
have discovered/Present Perfect Simple
The number of international tourists _______ dramatically over the past decade as travel became more affordable. (increase)
has increased/Present Perfect Simple
The company ___________ innovative software that completely changed how people manage their personal data. (develop)
has developed/Present Perfect Simple
Researchers_______ the effects of social media on mental health for more than a decade. (examine)
have been examining/Present Perfect Continuous
The city _________ its transport system since the population started to grow rapidly. (expand)
has been expanding/Present Perfect Continuous
Many students ______ for the IELTS test since they ___ to study abroad. (prepare/decide)
have been preparing/decided/Present Perfect Continuous
Governments around the world ________ stricter laws to reduce carbon emissions. (implement)
are implementing/ Present Continuous (and Passive)
A new vaccine________ in several countries to ensure its safety and effectiveness. (test)
is being tested/Present Continuous (and Passive)
When the internet ______ widely accessible, communication _______ almost overnight. (become,transform)
became/transformed/Past Simple
Economists __________ that global inflation ____small businesses the most. (warn/affect)
are warning/is affecting/Present Continuous (and Passive)
