1 . Currently, about 35,000 works ________ in over 300 rooms in the Louvre, and it would take a lifetime to see everything.

A．were displaying	B．are displaying
C．were being displayed	D．are being displayed

2 . In the near future, more advances in the robot technology _______ by scientists.

A．are making

B．are made

C．will make

D．will be made

3 . I like these English songs and they ________ many times on the radio.

A．taught	B．have taught
C．are taught	D．have been taught