_______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
| A．To wait |
B．Have waited |
C．Having waited |
D．To have waited |
The wet weather will continue tomorrow, when a cold front to arrive.
| A．is expected | B．is expecting | C．expects | D．will be expected |
When he the door, he found his keys were nowhere.
| A．would open | B．opened | C．had opened | D．was to open |
With April 18’s railway speedup, highway and air transport will have competed with service for passengers.
| A．good | B．better | C．best | D．the best |
I send you 100 dollars today, the rest in a year.
| A．follows | B．followed | C．to follow | D．being followed |
My parents in Hong Kong. They were born there and have never lived anywhere else.
| A．live | B．lived | C．were living | D．will live |