Going on a trip________be expensive and difficult , so making a plan is necessary. A. must B. ought to C. shall D can
The CDs are on sale!Buy one and you will get___________completely for free.
Whether the children have______fun in school has become________public concern.
---Hi, Tom! Could you spare me a minute? I want to have a word with you. ---Sure, Jean. _________.
---_______ one and a half months enough for the project to be finished? ---I am afraid not. The professor is ill and only after he recovers ________ go on with it.
---What did Kincaid say just now? ---He said he ________ a dog if he hadn’t been away from home too much.