It is dangerous football in the street.
| A．play | B．to play | C．playing | D．played |
Mary likes helping others._______, she often helps the old cross the road after school every day.
| A．Such as | B．For example | C．For free | D．Just as |
I didn't understand_______. So I put up my hand to ask.
| A．what my teacher says |
| B．what did my teacher say |
| C．what my teacher said |
| D．what does my teacher say |
—Where were you doing when I called at your house this morning?—Oh，I______ for a friend from New York at the airport.
| A．waited | B．was waiting | C．have waited | D．am waiting |
David is always so busy____he has little time for his family.
| A．if | B．until | C．that | D．Which |
—Can you repeat what I said just now?—Sorry，I didn't hear it.I________out of the window.
| A．look | B．looked | C．am looking | D．was looking |