Look, dark clouds are gathering. It is________ to rain soon.
| A．probably | B．possibly |
| C．likely | D．perhaps |
The children __________ lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
| A．must have got |
| B．must get |
| C．should have got |
| D．should get |
-Where did you get this book?
-I picked it up from a second-hand bookshop if you __________ know.
| A．must |
| B．will |
| C．can |
| D．shall |
Don't be angry with us. We __________ with you together, but we were busy with our final reports when you called in.
| A．would eat out |
| B．must have eaten out |
| C．should eat out |
| D．could have eaten out |
-__________ I turn on the TV for you, Grandpa?
-Yes, thanks a lot, my dear. You're so considerate.
| A．May |
| B．Shall |
| C．Will |
| D．Need |
With so much money, he __________ worry about a little thing like 5 cents ！
| A．can |
| B．must |
| C．may |
| D．should |