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A. IfB. UnlessC. WhileD. Since

【題目】The upset mother thought to herself, “If only I ______ what's going on in my little boy's head right now.”
A.know
B.knew
C.have known
D.had known

【題目】At the age of 14, Father had to leave school and start working. There would be no one to support the family _______ he not worked.
A.did
B.has
C.had
D.was

A. withB. inC. beyondD. to

【題目】The first thing you must remember is that in order to succeed, it is almost compulsory that you ______ optimistic.
A.be
B.are
C.must be
D.have been

A. move it upB. turn it upC. put it upD. make it up

【題目】—Did you make it at last?
—Yes. But for your help , it ________a serious loss.
A.would cause
B.must have caused
C.would have caused
D.may cause

【題目】His parents insisted that he __________English well when he was in junior school.
A.would learn
B.must learn
C.learned
D.learn