Later, these rocks proved that ___ in the distant past the Antarctic was covered by plants.
Mr. Li’ s house is so big, about _____ours.
Up to now, Marin _____in the library for about two hours.
Recently, there have been many occasions ______ you have attended events on your own.
In front of our house ________ we used to swim.
--Don’t worry, Mum. The doctor said it was only the flu. --_______! I’ll tell Dad there’s nothing serious.