Thirty years ago this month，China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade．
| A．to open | B．opened | C．opening | D．having opened |
Linda didn’t get there on time because of the bad weather. What’s more, her car was in poor .
| A．position | B．condition | C．situation | D．direction |
by his friends and relations，he decided to send his invention to the patent office to get recognition for his successful idea．
| A．Having pressed | B．Being pressed | C．Pressed | D．To be pressed |
We are at your service. Don’t _______ to turn to us if you have any further problems.
| A．desire | B．manage | C．hesitate | D．seek |
No one really knows exactly when the first people arrived in ______ we now know as New Zealand.
| A．that | B．which | C．what | D．where |
The manager _______ the workers how to improve the program since 9 a.m.
| A．has told | B．is telling | C．has been telling | D．will have told |