1.It is said some flying things have visited the earth from

1.It is said some flying things have visited the earth from _______ other worlds in _______ space.
A.the...the B.the.../ C./...the D./.../
2.There is ________ "s" in the word "stone".
A.a B.an C.the D./
3.________ space plane looks like ________ ordinary plane.
A.A...a B.A...an C.An...an D.The...a
4.________ young should help _________ old.
A.The;the B.The;a C.A;the D.A;a
5.________birds/Birds can fly very high in _______ sky.
A./...the B.The...the C./...a D./.../
6.Bob hit ________ .
A.Tom's face B.Tom on the face C.Tom in his face D.Tom in the face
7.There is ________ 800-meter-long bridge over the river.
A.an B.a C.the D./
8.Our knowledge of ________ universe is growing all the time.
A.an B.a C.the D./