__________ in London, he was eager to see the Big Ben.
| A．Upon his arrived |
| B．Once his arrival |
| C．The moment he arrived |
| D．As soon as arrived |
.
In peace, too，the Red Cross is expected to send help___________ there is human suffering.
| A．whoever | B．wherever | C．whatever | D．however |
.
Mr Smith has bought a new house in the country, around___________some green trees.
| A．which is | B．it is | C．which are | D．them are |
.
I'd like to have visited the Palace Museum last week, but something unexpected___________to my father.
| A．had happened | B．happened | C．has happened | D．happens |
.
Do you really want to borrow the old room which is empty_______a broken desk and a chair?
| A．except | B．except for | C．except that | D．besides |
.
It is going to rain today. Take an umbrella with you to___________you from the rain.
| A．stop | B．prevent | C．keep | D．protect |