UnitOne

　　1.shouldn'thavebeentothecinemalastnight

　　2.wouldhave;toldhimtheanswer

　　3.theyneedn'thavegoneatall

　　4.musthavehadtoomuchworktodo

　　5.mighthavebeeninjuredseriously

　　unit2

　　1.itisawondertofind

　　2.Itisasurpriseforustofind

　　3.itisawasteoftimetoarguewithhim

　　4.It'sacomforttoknow

　　5.Itisareliefforustolearn

　　unit3

　　1.Hetriedsendingherflowers,butitdidn'thaveanyeffect.

　　2.Idon'tregrettellingherwhatIthought,evenifIupsether.

　　3.ThewindowwasbrokenbecauseIforgottocloseitwhenIleft.

　　4.Weregrettoinformyouthatthematerialsyouorderedareoutofstock.

　　5.Hewelcomedthenewstudentandthenwentontoexplainthecollegeregulations.

　　unit4

　　1.Petrolnowistwiceasexpensiveasitwasafewyearsago.

　　2.Theirsisaboutthreetimesasbigasours.

　　3.LatinAmericancustomerstalktwotofourtimesaslongonthephoneaspeopleinNorthAmerica.

　　4.thefeeforcellphonesistypicallytwiceasmuchasforcallsmadeoverfixedlines

　　5.cantransmit250,000timesasmuchdataasastandardtelephonewire

　　unit5

　　1.Youmightaswellgotheretoseewhetherthereistheinformationyouneed.

　　2.Wemightaswellcallitfreedom.

　　3.Youmightaswellringandtellthemyou'regoingtovisitthem.

　　4.Wemightaswellwalkhome.

　　5.Wemightaswellfindaneasieronetoread.