If there ______ no water or air on the earth, all living things would die.
| A．is | B．were | C．are | D．will be |
____ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge.
| A．Were | B．Should | C．Would | D．Will |
Whoever is never ______ with the progress he has made will be a success.
| A．content | B．proud | C．abundant | D．familiar |
Canada is a country ________ many different nationalities as well as one with foreign immigrants __________ the majority of its population.
| A．making up of; occupied with | B．consisting of; making up |
| C．made up of; consisting of | D．consisted of; taking up |
It wasn’t until dark _________ he found _________ he thought was the correct way to solve the problem.
| A．when , that | B．that , that | C．when , what | D．that , what |
The editor-in chief asked me to write an article for him, ______ about AIDS patients in China.
| A．that | B．one | C．it | D．this |