.
Because of the sharp drop of birth rate, the number of students sitting the college entrance exams ______ all the time
| A．is declining | B．has declined |
| C．have been declined | D．were declining |
Ms Jonesher stepmother travels once or twice every other year.
| A．and | B．besides | C．as well as | D．and along with |
It really seemed ages ____ the police came on the scene and cleared away the damaged cars．
| A．before | B．after | C．when | D．as |
QQ,you can chat with your friends, makes communication easy．
| A．how | B．where | C．that | D．which |
Lady Gaga has put off her concerts because of the difficulties _______by the ongoing strikes.
| A．causing | B．to cause | C．to be caused | D．caused |
________ he driven more carefully, the accident would not have happened the other day.
A
. BeB. Had C. Has D. Would have