Now and then they would ______ our house and have a talk with us.
| A．call on | B．drop in at | C．drop in on | D．drop in |
_____in the queue for half an hour, the old man suddenly realized he had left the money in the car.
| A．Waiting | B．To wait | C．Having waited | D．To have waited |
____ was known to all, John had broken his promise ___ he would stay with us for some time .
| A．As; that | B．As; which | C．It; that | D．Which; that |
The Wenchuan earthquake in 2008 is believed ____more than 70,000 people and made thousands homeless, _____it perhaps the most destroying tsunami in history.
| A．to kill; making | B．to have killed; making |
| C．having killed; to make | D．killing; made |
Berners-lee made ____possible for everyone to use the Internet.
| A．that | B．this | C．it | D．what |
They’ve _______ a lot of high-rise buildings recently.
| A．put up | B．give up | C．pick up | D．stand up |