The recent earthquakes have caused concern because they happen _____ population centers and have caused huge damage.
| A．to be hit | B．hitting | C．having hit | D．to have hit |
He is kind and always _______ his help to others.
| A．receives | B．brings | C．takes | D．offers |
---Do you still have a headache, Billy?
--- No, it's ________. I'm all right now, mum.
| A．dropped | B．run | C．left | D．gone |
They _______ some books from the liarary last week.
| A．lend | B．lends | C．buy | D．borrowed |
The tree must ________ three times a week.
| A．water | B．is watering | C．be watered | D．waters |
At weekends I prefer _______ at home to _______out.
| A．stay, going | B．staying, go | C．staying, going | D．to stay, go |