1.Therearefivepairs____,butI'matlosswhichtochoose.AtobechosenBtochoosefromCtochooseDforchoosing2.Aftersheconsideredtheproblem,shegotatallboxtostand_____.AbyBonCupDwith3.CharlesBabbageisgenerallyconsidered______the

　　1.Therearefivepairs____,butI'matlosswhichtochoose.

　　Atobechosen

　　Btochoosefrom

　　Ctochoose

　　Dforchoosing

　　2.Aftersheconsideredtheproblem,shegotatallboxtostand_____.

　　Aby

　　Bon

　　Cup

　　Dwith

　　3.CharlesBabbageisgenerallyconsidered______thefirstcomputer.

　　Atoinvent

　　Binventing

　　Ctohaveinvented

　　Dhavinginvented

　　4.'WhereisDavied?""Heisupstairs____readytogoout."

　　Atoget

　　Bgetting

　　Ctobegetting

　　Dhavinggot

　　5.Withalotofdifficultproblems_____,thenewly-electedpresidentishavingahardtime.

　　Asettled

　　Bsetting

　　Ctobesettled

　　Dbeingsettled

　　6.Ifthecarwon'tstart,____it.

　　Atrypush

　　Btrypushing

　　Ctrytopush

　　Dtotrypushing