—It’ll take me about two hours to do the work!—Oh, ! I could do it in half an hour.
Henry had just given himself for lost ______ he was spotted by a ship.
—Could I use your bike? —Yes, surely you ______.
He couldn’t ______ the fact that the money was found in his house.
Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
—Don’t forget to visit me when you come to Beijing. —______.