She felt ________ when she was asked to solve such a ________ maths problem.
challenging; challenged
challenged; challenging
challenging; challenging
challenged; challenged
Please speak ________, or the baby will wake up.
quiet
quietly
quick
quickly
Many plants ________ because there was no rain for a few months.
died
die
are dying
were died
Mia went to the library ________ more evidence about colour blindness.
find
to find
finding
found
You should protect your personal information ________ safe online.
keep
keeping
to keep
kept
—Why did you give up ________ English? —Because I found it too difficult.
learn
to learn
learning
learned
—Clean the table after you finish ________ your meal, will you? —OK. Leave it to me.
eat
to eating
to eat
eating
—Did you see ________ special in the Victory Museum? —Yes, an artwork with thousands of glass tears.
anything
something
everything
nothing
The story of Liuchi Lane has been passed down for ________ years.
two hundreds
hundreds of
hundred of
two hundreds of
There are ________ people camping by Nanhu Lake every summer vacation in Changchun.
thousand
three thousands
thousand of
thousands of