单项选择题
（）troublesome the problem is， he faces it with patience.
A.No matter
B.Although
C.Despite
D.However
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（）formaloccasions，youshouldtalkaboutsomeworldissuesorsocialproblems，notaboutyourselforyourfamily.
A.In
B.At
C.On
D.By -
单项选择题
Onlyafterthestudentshavemasteredtherulesofpronunciation（）.
A.can they memorize words more easily
B.when can they memorize words more easily
C.then they can memorize words more easily
D.when they can memorize words more easily -
单项选择题
Whynot（）toProfessorSmithforadvice？Heisanexpertinthisfield.
A.go
B.your going
C.to go
D.you go
