I can hardly imagine Peter ________ across the Atlantic Ocean in five days.
| A．sail | B．to sail | C．sailing | D．to have sailed |
In some cases, different approaches __________ the same scientific problem lead to the conflicting theory.
| A．to | B．of |
| C．in | D．for |
A notice was __________ in order to remind the students of the changed lecture time.
| A．sent up | B．given up |
| C．set up | D．put up |
The physics teacher once said that as __________ well-known, thunders __________ make electricity.
| A．is; can | B．was; could |
| C．was; should | D．be; can |
I'm sorry to __________ you, but can you tell me how to get to the library?
| A．bother | B．puzzle |
| C．annoy | D．worry |
—Beautiful day, isn't it? Let's go out for a picnic.
— __________.
| A．Sounds great | B．That's all right |
| C．Good luck | D．Have fun |