【正文】 e serious.A．so B．because C．a(chǎn)lthough D．if13．Lucy, don’t turn off the puter before closing all programs, ________you could have problems.A．or B．a(chǎn)nd C．but D．so14．Mr. Pitt had to cheer up soon, ______ he would lose the game pletely.A．a(chǎn)nd B．so C．but D．or15．Just leave the key to the exercises behind, you will be dependent on it.A．or B．a(chǎn)nd C．so D．but16．Those who want to lose weight have to exercise every day, _________ they might get fat again.A．though B．if C．so that D．or17．— Jim is a helpful student.— I think so. Thanks to him, ________ we can’t do it successfully.A．or B．so C．but D．because18．Do you want to go now, would you like to leave later?A．but B．or C．a(chǎn)nd D．so19．You’d better wake up Tom at 6：30， he will be late for the match．A．if B．or C．a(chǎn)nd D．but20．Put your books in the drawer, _____ they won’t get lost.A．or B．a(chǎn)nd C．but D．so21．I like your story, _______ I’m confused by the ending. Can you explain it?A．a(chǎn)nd B．or C．so D．but22．We will never see Kobe play another basketball game, ________we will always remember him.A．because B．unless C．but D．if23．Hawking is no longer with us, he will continue to inspire the world.A．so B．if C．but D．a(chǎn)s24．I like dancing, ______ I don’t have enough time to practice it.A．or B．so C．but D．because25．Going to the movies is good, ______ I really only like listening to music.A．a(chǎn)nd B．but C．so D．or26．He studies hard all the time, _________ he has made rapid progress in many ways.A．so B．because C．but D．yet27．It’s not always safe to pay over the Internet, you should be careful.A．so . B．a(chǎn)fter . C．because . D．a(chǎn)s soon as28．Air pollution is being more and more serious, actions must be taken to stop it.A．so B．but C．or D．until29．Liza speaks English very well，_______she doesn’t know Chinese.A．a(chǎn)nd B．so C．but D．Because30．Many people aren’t attracted to this project, ________ I want to know more about it.A．a(chǎn)s B．or C．until D．but31．I’ve wanted to read The Little Prince for long, _______ today I finally borrowed the book from the library.A．or B．since C．a(chǎn)nd D．because32．The dress is really nice, _________it doesn’t look good on me .A．for B．so C．but D．or33．The dress is very nice, ________ it doesn’t look good on me.A．or B．but C．so D．until34．Alice likes swimming, ________ there is no swimming pool near her home.A．a(chǎn)nd B．but C．unless D．because35．—Can you help me with my housework?— I39。d like to, ________I have to look after my baby sister.A．because B．a(chǎn)s C．but D．if36．Mike recently got a package, ________ he didn’t remember buying anything.A．so B．or C．for D．but37．Stephen Hawking had a serious illness, _______ he kept studying physics.