The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |
.A fire broke out in a neighbouring street yesterday,but it was soon_______by the firemen.
A,gone out B, put out C,given out D,made out
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