It is fairly common in Africa for there______ a group of expert musicians surrounded by others who also join in the performances.
| A．being | B．to be |
| C．be | D．is |
During the race many cars ______ while my new solar car came out first.
| A．broke out | B．broke away | C．broke down | D．broke up |
In the garden there are a lot of flowers ______ I don’t know the names.
| A．of which | B．from which | C．to which | D．about which |
I was greatly ______ at how he worked out the ______ problem in a creative way.
| A．amazed; confused | B．amazing; confusing |
| C．amazed; confusing | D．amazing; confused |
My painting won the first prize, _____ changed my plans for the future.
| A．which | B．where | C．that | D．what |
—It’s a little bit cold today, but you have sweat all over.
—Yes, I _______ around the city for almost three hours.
| A．have hiked | B．was hiking | C．am hiking | D．have been hiking |