the course very difficult, she decided to move to a lower level.
A.Find B.Finding
C.To find D.Found
Volunteering gives you a chance _______ lives, including your own.
A.change B.changing
C.changed D.to change
There are still many problems ______ before we are ready for a long stay on the Moon.
A.solving B.solved
C.being solved D.to be solved
The park was full of people, ________ themselves in the sunshine.
A.having enjoyed B.enjoyed
C.enjoying D.to enjoy
（2016 • 北京）________ it easier to get in touch with us, you’d better keep this card at hand.
A.Made B.Make
C.Making D.To make
(2016·北京)______ over a week ago, the books are expected to arrive any time now.
A.Ordering B.To order
C.Having ordered D.Ordered
