.By serving others, a person focuses on someone other than himself or herself,_____can be very eye---opening and rewarding.
| A．who | B．which | C．what | D．that |
I appreciated ____ the opportunity to study abroad two years ago.
| A．having been given | B．having given |
| C．to have been given | D．to be given |
The International Day against Drugs, aimed at warning people to keep away from drugs， _________ on June 26th every year．
| A．taking place | B．takes place | C．took place | D．taken place |
. Progress so far has been very good. _______, we are sure that the project will be completed on time.
| A．However | B．Otherwise | C．Therefore | D．Besides |
Only when you leave your parents for college education _______ how much you love them.
| A．do you realize | B．you realize | C．you will realize | D．will you realize |
It is the experience he had as a boy ______ has formed his present personality.
| A．that | B．who | C．which | D．when |