The young girl walked ____the forest and saw a big river at last.
| A．on | B．over | C．through | D．across |
She likes playing chess while her sister likes playing piano.
| A．the; the | B．the; / | C．/; the | D．/; / |
I spent half an hour ________ the piano every day.
| A．to play | B．play | C．playing | D．played |
I _______ to learn to play the piano ever since then.
| A．began | B．begins | C．begun | D．have begun |
----Why not _______ to the park now?
---- Good idea! Let’s go.
| A．go | B．to go | C．going | D．gone |
They were made ________ the classroom after class.
| A．to clean | B．clean | C．to cleaned | D．cleaning |