— Do you know mother giant pandas have only one or two babies ___________?
—Sorry, I don’t know.
| A．at a time | B．at time |
| C．at times | D．at that time |
We should set up some shelters _____the homeless people.
| A．help | B．helping | C．helped | D．to help |
It is_______ interesting book ,we all like it.
| A．such a | B．such an | C．so a | D．so an |
Our teacher told us ______carefully in class.
| A．listen | B．to listen | C．listened | D．listens |
Some ______are ______their time to help the old people.
| A．volunteer; volunteer | B．volunteers; volunteering |
| C．volunteering; volunteers | D．volunteers; volunteers |
– He looks unhappy?-- Let’s ________
| A．cheer him up | B．helped out him | C．look him after | D．angry with him |