Beneath our feet ______ that our life depends on for food and clothing. [ ]

John, have you gone over your lessons learnt this morning—Not yet.—You should know _____.

The teacher will give us a talk on how _____ English well.

The plane will _______ soon. Soplease be quick, driver.

It is well known to us all ____ China sent up a manned spaceship to outer spaceSuccessfully last year.