---Are you going to Tom’s birthday party?
--- _______. I might have to work.
| A．It depends | B．Thank you | C．Never mind | D．Sounds great |
We have no other ways but ______ here for him to come.
| A．waiting | B．wait | C．to wait | D．waited |
The traffic rule says that the children ______less than 40 pounds and under the age of four must be in a child safety seat.
| A．being weighed | B．weigh | C．weighed | D．weighing |
The Gate of Fortune, from _____ top tourists can enjoy a wonderful view, has attracted lots of visitors.
| A．its | B．whose | C．where | D．which |
--- I wonder how much you charge for your service.
--- The first two are free ______ the third costs $30.
| A．while | B．until | C．when | D．before |