In a certain PLMN,an average subscriber makes 5 calls during office hours （8 AM - 6 PM)

A、is certain of

B、certain

C、certain of

D、he is certain of

The method of focusing refers to introduce the ______ rather than _____ things.

A. certain aspects; all

B. all; certain aspects

C. certain aspects; certain aspects

D. all;all

A.It ’s ()that all the people invited will come before nine、

B.Don ’t be so ().

C.certain,certain

D.certain,sure

E.sure,sure

F.F.sure,certain

A. is certain of

B. certain

C. certain of

D. he is certain of

The company is run at a loss. Certain problems were ______ from the outset.

A、apparatus

B、apparent

C、applied

D、apprehensive

A.On

B.With

C.on

D.At