We must try ______ best to make our city more beautiful.
| A．our | B．ours | C．we | D．us |
---Why didn’t you go shopping with me two hours ago?
---Because my mother________ me outside.
| A．waited for | B．is waiting for |
| C．was waiting for | D．has waited for |
Not only Jim but also his parents ______ a few places of interest since they came to China.
| A．has visited | B．will visit |
| C．have visited | D．visited |
This robot is supposed to save a lot of labor, but it remains a problem if it ______.
| A．is | B．saves | C．does | D．has |
—Sam, come downstairs, please. I need your help.
—Sorry，mum. I on the phone..
| A．am talking | B．talked |
| C．was talking | D．have talked |
—When and where to spend the holiday ____ yet.
—Let’s make it now.
| A．is decided | B．doesn’t decide |
| C．has not been decided | D．has decided |