I don’t think dropping litter is allowed in Yellow River Park, ________?
| A．do I | B．is it |
| C．isn’t it | D．don’t I |
Lucy spent three years _______ Chinese before she came to China.
| A．on learning | B．to learn |
| C．learning | D．learn |
Tina used to __________a round face.
| A．is | B．have |
| C．be | D．has |
It was difficult for the rich _____ a happy life.
| A．to have | B．having | C．had | D．have |
We’ve walked for a long time.Let’s stop ____a good rest
| A．having | B．had | C．to have | D．have |
A Wechat (微信) is an invention __________ can help people talk to friends, share photo, ideas and feelings freely.
| A．which | B．who | C．whose | D．/ |