The scientist's discoveries were of great help to mankind．
A．a；the B．a；／ C．／；／ D．the；the
While building a bridge over the Changjiang River， ．
A．a big rock was discovered in the water
B．there was a big rock discovered
C．a big rock discovered in the water
D．the workers discovered a big rock in the water
I didn't know who for the broken window．
A．to be blamed B．to blame C．is to blame D．is to be blamed
I can't to London，because the lines are always busy．
A．get out B．get through C．go through D．get along
Though they are not sure of the long-term ，all the scientists agree to start the research immediately．
A．affect B．result C．effect D．effort
We gave them a lot of help in the of money．
A．type B．kind C．form D．way
