The newly-founded company is faced with lots of challenges, _________ the financial problem is the worst.
| A．which | B．of which |
| C．without which | D．with which |
He wrote a lot of novels, ______ regarded as masterpieces.
| A．dozens of them | B．dozens of which |
| C．a dozen of which | D．dozen of that |
Don’t forget to turn on your radio at 7 p.m. this evening. We’ll be back _______ then.
| A．in the air | B．by air | C．on the air | D．off the air |
----Did you see the manager in the office?
----Yes. He _______ by a journalist from China Daily.
| A．had been interviewed | B．interviewed |
| C．has interviewed | D．was being interviewed |
______ twice a year, whether it is a car, a bus or a truck, is the rule that every driver must obey in this city.
| A．Examing | B．Examined | C．Being examined | D．Having been examined |
Children should be instructed to put things _____ they belong in their early childhood.
| A．where | B．in which | C．to which | D．what |