Grand Slam winner Li Na has made up her mind that she _____ from tennis because of her knee injuries this October.
The field research will take Joan and Paul about five months;it will be a long timewe meet them again.
John received an invitation to dinner,and with his work_____ ,he gladly accepted it.
—Did Peter fix the computer himself?—He _______,because he doesn’t know much about computers.
Last week,only two people came to look at the house, ______wanted to buy it.
You can only be sure of_____you have at present;you cannot be sure of something_____you might get in the future.()