However, at times this balance in nature is disturbed by human activities, _______ a number of possibly unforeseen effects.
The ________ moment they had looked forward to ________ finally.
Who else except a millionaire could ________ to use such an expensive car?
Jack ______ the bus as soon as it stopped; and then to his joy he met an old friend of his on that bus.
I know I didn’t forget ________ my camera with me because I clearly remember ________ it in my bag.
— It’s burning hot today, isn’t it?— Yes. ________ yesterday.