She changed so much that I could hardly ____ her when we met again after a separation of 20 years.
| A．know | B．recognize | C．remember | D．tell |
We began to open to the outside world in the ate 1970s. , there have been great changes in the country.
| A．As a result of | B．As a result | C．First of a11 | D．After all |
Sun Yang, a young Chinese swimming talent, several gold medals before the 2012 London Olympics.
| A．won | B．has won | C．had won | D．were to win |
In hot summer, milk quickly turns sour it is refrigerated.
| A．while | B．if | C．until | D．unless |
He found himselfby a crowd of excited people and to escape.
| A．surrounded; trying | B．surrounding; trying |
| C．surrounding; tried | D．surrounded; tried |
---John, why are you so upset?
---Imy cell phone all morning but it is nowhere to be found.
| A．am looking for | B．have looked for |
| C．have been looking for | D．had looked for |