Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
A、assure
B、secure
C、ensure
D、issue
Onlya(n)________fewwereinvitedtothedancingparty.
A、elect
B、special
C、select
D、selective
Idon'tknowhowwecanmake________onthetimetableforanymorecourses.
A、schedule
B、place
C、plan
D、room
Theenginehasbrokenandtheboatis______onthewater.
A、flowing
B、floating
C、drifting
D、sailing
Tostudyaforeignlanguage,__________.
A、agooddictionaryshouldbebought
B、buyingagooddictionaryisnecessary
C、youshouldbuyagooddictionary
D、itisnecessarythatyouwillbuyagooddictionary