______ in papers, he didn’t notice my coming.
—Shall I give you a ride as you live so far away? —Thank you,________.
At times the balance in nature is____, resulting in a number of possibly unforeseen effects.
If I ruled the world,I would________ the world________ everything that is bad.
Only after the woman had her own child ______how difficult it was to be a mother.
We ________ the problem for a long time, but we didn’t reach any agreement.