Idon'tknowhowwecanmake________onthetimetableforanymorecourses.

• A.schedule
• B.place
• C.plan
• D.room

Wemust______thattheexperimentiscontrolledasrigidlyaspossible.

• A.assure
• B.secure
• C.ensure
• D.issue

Theboyranoutoftheclassroomwithouttheteacher's_______.

• A.command
• B.conviction
• C.consent
• D.compromise

________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.

• A.Ifyoucompare
• B.Comparethem
• C.Whencompared
• D.Acomparison

Itisusefultoscience_______theearthasanobjectinspace.

• A.toconsider
• B.whichconsiders
• C.considers
• D.theconsiderationof

Becareful,_______you'llfalldown.

• A.onthecontrary
• B.orrather
• C.orelse
• D.asfor