___know if they fixed his computer？

A.taxe, boxe, fixe

B.taxi, doux, relaxe

C.luxe, dix, examiner

D.exact, six, deux

A.able to know

B.supposed to know

C.supposing to know

D.going to know

A.should know

B.would know

C.knew

D.know

________________(谈到物理学), I know nothing.

Not until the early years of the 19th century ______ what heat is．

A．man did know B．man know

C．didn't man know D．did man know

A.expressing

B.express

C.expressed

D.expression

A.A.he knows

B.B.he doesn't know

C.C.does he know

D.D.doesn't he know

From the passage we know that the eel is a kind of

A．bird.

B．fish.

C．insect.

D．land animal.