The machine has been made easier for it____.
| A．to operate | B．operated |
| C．being operated | D．to be operated |
His father disappeared, ________ two children and never _______ from again.
| A．left; being heard | B．leaving; heard | C．left; be heard | D．leaving; to be heard |
Does the way you thought of ________ the water clean make any sense?
| A．making | B．to make | C．how to make | D．having made |
In order not to be disturbed, I spend three days _______ in my study.
| A．locking | B．locked | C．to lock | D．lock |
Although he didn’t expect _______ me here, he advised _______ to the nearest restaurant.
| A．to find; going | B．finding; to go | C．to find; to go | D．finding; going |
They ’ll have other meetings like this in the weeks ________.
| A．following | B．to follow | C．followed | D．will follow |