They own two cars, not to _____ a motorbike.
| A．speak | B．say |
| C．talk | D．mention |
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 |
I regret ___ harder in the past two years.
| A．not having studied | B．having studied | C．having not studied | D．not being studied |