---Which book do you think is the most useful to my studies?---________, as long as you read it. In fact, they are out of date.
_______ the news of his father's death, he burst into tears.
I searched for my wallet and it wasn't there. At first, I thought I _______ it at home. Then I remembered _______ it out to pay for the taxi.
The thief drove as fast as he could to escape ________ by the police.
We’ d better try to the plan again, I think, before we with it.
Do you have any of what life would be like if we lived on other planets?