1 . (2017·北京) Jim has retired, but he still remembers the happy time ________ with his students.

A．to spend	B．spend
C．spending	D．spent

2 . The producer comes regularly to collect the cameras ________ to our shop for quality problems.

A．returning	B．returned
C．to return	D．to be returned

3 . From the dates        on the gold coin, we know that it was made 500 years ago.

A．marking

B．marked

C．to mark

D．to be marked

4 . For breakfast he only drinks juice from fresh fruit________on his own farm.

A．grown	B．being grown
C．to ge grown	D．to grow