--When did you become a volunteer for the elderly?
-- Two years ago. I ______ this group since then.
| A．joined | B．took part in | C．have joined | D．have been in |
The little girl is fortunate to get help from so many strangers.
| A．lucky | B．excited | C．happy | D．grateful |
I will pay you a visit next month.
| A．call at | B．call on | C．call up | D．call back |
The enemy suddenly appeared.
| A．went in | B．left | C．showed out | D．came in sight |
The little boy can draw a picture on his own.
| A．himself | B．by himself | C．of himself | D．lonely |
The children in poor areas can’t afford their education. We should think ________ to help them.
| A．what can we do | B．what we can do |
| C．how can we do | D．how we can do |