Whiledoingcalculationfortheproject,thedesigners____anewsolutiontoageologicalproblem.
A、fellinto
B、stumbledupon
C、setout
D、discovered
Josephwasverylucky（）withhislife;healmostdidnotgetoutoftheroom.
A、toescape
B、tohaveescaped
C、toescaping
D、tobeescaping
Hiscompanionshavethreatenedto__hiscrimestothepolice.
A、impose
B、express
C、enclose
D、expose
Iwastohavemadeaspeechif_____.
A、Iwasnotcalledaway
B、nobodywouldhavecalledmeaway
C、Ihadnotbeencalledaway
D、nobodycalledmeaway
_____,hewouldnothaverecoveredsoquickly.
A、Hadn’thebeentakengoodcareof
B、Hadhenotbeentakengoodcareof
C、Hadnothebeentakengoodcareof
D、Hadhebeennottakengoodcareof