The house caught___fire last night but no one knows who set ___fire to it.
A. X；X B.X;a C, a; a D, a; X
The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
A.who B.when C.on which D.Which
.The final examination is coming up soon. It's time for us to ____our studies.
A, get down to B, get our C, get back for D, get over
---What do you think of the book?
---Oh,excellent. It's worth____a second time.
A. to read B.to be read
C, reading D,being read
---Have you ____some new ideas?
---Yeah. I'll tell you later.
A.come about B.come into
C.come up with D.come out with
.I have___all my papers but I still can't find my notes.
A.looked through B.looked for
C.looked after D.looked out
