Go back home now, Mary. Your parents ______ your safety.
| A．are concerned about | B．are concerned with |
| C．are concerned on | D．concern of |
Xi’an was the last city ______ he visited in China.
| A．where | B．which | C．that | D．in which |
The mountains lie near our hotel. There is a fine ________ of the mountains from our hotel window.
| A．scenery | B．picture | C．view | D．screen |
They want to make _____ clear to the public that they are doing an important and necessary job.
| A．that | B．this | C．it | D．one |
It is suggested that another school___________ in our city.
| A．should build | B．be set up |
| C．will be set up | D．will build |
Computersin offices and homes since 1970s．
| A．was | B．had been used | C．have been used | D．has been used |