The students listened carefully to the teacher with their eyes _____ on the blackboard.
| A．focused | B．to focus |
| C．focusing | D．being focused |
She and her family bicycle to work, _________ helps them keep fit.
| A． |
which |
B． |
who |
C． |
as |
D． |
that |
Susan had quit her well-paid job and _________ as a volunteer in the neighborhood when I visited her last year.
| A． |
is working |
B． |
was working |
C． |
has worked |
D． |
had worked |
_________ along the old Silk Road is an interesting and rewarding experience.
| A． |
Travel |
B． |
Traveling |
C． |
Having traveled |
D． |
Traveled |
_________ we don't stop climate change, many animals and plants in the world will be gone.
| A． |
Although |
B． |
While |
C． |
If |
D． |
Until |
-Hi, I'm Peter. Are you new here? I haven't seen you around?
-Hello, Peter. I'm Bob. I just _________ on Monday.
| A． |
start |
B． |
have started |
C． |
started |
D． |
had started |