The old city wall ______ in the Ming Dynasty.
| A．was been built | B．has been built | C．was built | D．had been built |
Kroc was a salesman who met the McDonald brothers in 1954, when he _______ milkshake-mixing machines.
| A．had sold | B．was selling |
| C．would sell | D．has sell |
It was on the plane _____ I was travelling to Japan _____ I came across my former teacher.
| A．that; where | B．that; that |
| C．which; that | D．where; that |
We should well balance our work and relaxation, and ____________, as everybody would agree , can we have a good state of mind.
| A．if we keep doing that | B．in that case |
| C．only by doing that | D．due to that |
Whenever there is a latest phone model being produced by companies such as Apple, Samsung, LG, Sony, etc., the public is all eyes and all ears on ______consists of the latest product______is in the market.
| A．what , what | B．that, that |
| C．that, which | D．what, that |
With social networking and the tools that are _______ to students today, we expect that they will have formed these social bonds really for life.
| A．accurate | B．available |
| C．abnormal | D．apparent |