1．Could you help me with housework __C__you are free today？(2016，无锡)
A．sinceB．thoughC．ifD．until
2．__B__ Joe ________ Steve may go camping with you on Tuesday，because they are not allowed to go out on school days.(2015，丹东)
A．Either，orB．Neither，nor
C．Both，andD．Not only，but also
3．Some children prefer to eat junk food __A__ it's not good for their health.(2015，丹东)
A．althoughB．ifC．asD．when
4．I'll go to visit my aunt in England __D__ the summer holiday starts.(2016，呼和浩特)
A．whileB．since
C．untilD．as soon as
5．(导学号：05472109)—It's too late.I have to go now. —Oh，it's raining heavily outside.You'd better stay __A__ it stops.(2016，烟台)
A．until B．since C．while D．though
6．The boss was very rich，__B__ it didn't make him happy because he was always worried about losing his money.(2016，云南)
A．and B．but C．or D．although
7．—Mrs.Li，will you be angry __A__ your students don't obey the rules in class?
—A little.But I will stop them in a friendly way.
A．if B．unless C．though
8．My family always go somewhere interesting __A__ the holiday begins.(2016，天津)
A．as soon as B．so
C．so that D．even though
9．There will be less pollution __D__ more people use public transportation.(2015，南昌)
A．but B．though C．unless D．if
10．—What do you think of this soap operas?
—I think it's very boring，__D__ my mother can't wait to watch it every day.
A．and B．or C．so D．but
11．__B__ you smile at others，they will smile back.(2015，陕西)
A．Before B．When C．Until D．Though
12．—I want to travel to the Black Bear Island next weekend. —Good idea！Make a plan first，__A__ you will enjoy more beautiful scenery.(2016，哈尔滨)
A．and B．but C．however
13．We're going to Suzhou Amusement Park in Linda's car.You can come with us __A__ you can meet us there later.
A．or B．but C．and D．then
14．Daming hasn't done much exercise __D__ he got his computer.(2016，大庆)
A．when B．if C．though D．since
15．—How do you like the two pairs of trousers?
—They don't fit me well.They are __D__ too long ________ too short.
A．not only，but also B．both，and
C．neither，nor D．either，or
16．Which do you prefer to use to keep in touch with your friend，QQ __C__ MSN?
A．and B．but C．or D．so
17．The students can't go home __D__ they finish cleaning
the classroom，for it's their duty.
A．when B．since C．if D．until
18．Laura opened the door and rushed into the rain __B__ I could stop her.
A．until B．before C．after D．unless
19．(导学号：05472110)The world's population will still increase __B__ we do something to control it.
A．or B．unless C．but D．and
20．My mother prefers to take a bus to her office __B__ she has a car of her own.(2015，台州)
A．if B．though C．because D．until
21．A stupid man tells a woman to shut up，while a wise man tells her that her mouth is quite beautiful __C__ it is closed.(2016，河南)
A．unless B．since C．when D．though
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