The factory has been ________ for two years.
| A．open | B．to open | C．opening | D．opened |
He ___ on the grass, looking at the clouds in the sky.
| A．is laying | B．is lying | C．has laid | D．has lied |
His brother __ a lot of silkworms last summer.
| A．rose | B．fed | C．raised | D．grew |
On the wall __ two large portraits.
| A．hangs | B．hang | C．hanged | D．hanging |
Sunglasses can ___ us from strong sunlight.
| A．hold | B．prevernt | C．protect | D．make |
His father feels ___ his duty to help others.
| A．this | B．it | C．that | D．what |