Although he Was in poor health，Robert succeeded——other more famous engineers failed．
| A．which | B．that | C．what | D．where |
He is very popular among his students as he always tries to make them __________ in his lectures.
| A．interested | B．interesting |
| C．interest | D．to interest |
The children went home from the grammar school, their lessons __________ for the day.
| A．finishing) | B．finished |
| C．had finished | D．were finished |
__________ by a greater demand of vegetables, farmers have built more green houses.
| A．Driven | B．Being driven |
| C．To drive | D．Having driven |
The flowers his friend gave him will die unless __________ every day.
| A．watered | B．watering |
| C．water | D．to water |
Please remain __________ until the plane has come to a complete stop.
| A．to seat | B．to be seated |
| C．seating | D．seated |