GeneralMotors,oneoftheworld'slargestautomanufacturers,isexpandingits________inthiscountry.
A、existence
B、presence
C、location
D、residence
Tostudyaforeignlanguage,__________.
A、agooddictionaryshouldbebought
B、buyingagooddictionaryisnecessary
C、youshouldbuyagooddictionary
D、itisnecessarythatyouwillbuyagooddictionary
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
A、assure
B、secure
C、ensure
D、issue
Theenginehasbrokenandtheboatis______onthewater.
A、flowing
B、floating
C、drifting
D、sailing
Takeit______.Itisnothingbutajoke.
A、easy
B、easily
C、serious
D、seriously