【题目】 of your ability is one of the most important factors of success.
A.Convincing
B.To convince
C.Being convinced
D.Convinced

—It’s ______ on iTunes and Android for free.

A.availableB.essentialC.standardD.permanent

A.combinationB.confusionC.mixtureD.variety

【题目】When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.
A.that
B.which
C.where
D.when

【题目】George said that he would come to school to see me the next day, but he ______.
A.wouldn't
B.didn't
C.hasn't
D.hadn't

A.absorbingB.be absorbedC.to absorbD.absorbed

A.his theory wasB.was his theoryC.did his theoryD.had his theory

【题目】Jerry did not regret giving the comment but felt ______ he could have expressed it differently.
A.why
B.how
C.that
D.whether

【题目】Ordinary people can own guns in America, but that is not the in China.
A.case
B.freedom
C.fortune
D.system

【题目】I want to thank Professor Doris, without help I couldn't have made so much progress.
A.who
B.which
C.whom
D.whose