Research __________ out by several experts suggests that the oil spill in the Gulf has caused the fatal damage to the environment.
| A．to carry |
| B．carrying |
| C．being carried |
| D．having carried |
He suddenly fell ill, ______ prevented him from attending his friend’s wedding.
| A．why | B．what | C．that | D．which |
In some countries, ____ is called "equality" does not really mean equal rights for all people.
| A．which | B．that | C．what | D．one |
--- Do you know him?
--- Yes, but I can’t remember ______I met him for the first time.
A. where B. whatC thatD. if
_______ the sports meet will be held depends on the weather.
| A．Whenever | B．If | C．Whether | D．That |
The policeman, for his bravery, is going to give us a speech tomorrow.
| A．to know | B．known | C．having known | D．knowing |