They_________ China for two years.
| A．has been to | B．have been in |
| C．have gone to | D．has come to |
Do you finish the letter?
| A．to write | B．writing | C．write | D．writes |
Grandpa is getting old and he has trouble what others say to him.
| A．hear | B．to hear | C．hearing | D．have heard |
There are people in the park on weekends!
| A．such | B．so | C．so much | D．so many |
I invited her together, but she didn’t agree.
| A．sing | B．singing | C．to sing | D．sings |