[ Grammar ]
It is our responsibility to ________ our planet’s ecosystems.
A. preserve
B. preservation
C. preserving
D. preserver
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Grammar › View……………..girls over are my colleagues.
A. This
B. That
C. These
D. Those
Grammar › View
Which sentence has a modal verb?
A. I can swim.
B. I am swimming.
C. I will swim.
D. I have swum.
Grammar › ViewThere used __________ a stadium here, but it closed a long time ago.
A. be
B. to be
C. been
D. being
Grammar › View
Liz ___________ play her guitar 2 months ago, but now she can play it well.
A. couldn’t
B. could
C. can’t