Which of the following signs can be seen on the door of a shopping center?
If you have trouble pronouncing these words, you can repeat them over and over again ________ you are comfortable with them．
一Would you like to go to the amusement park?—If Jack does，________．
—It’s difficult to get to the other side of the river．—I think a bridge ________ over the river．
She said she returned the book to the library．I'm sure she ________．
一Do you know why he didn’t ________ a word when he ________ to?—Because he was too nervous．
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