—Look at these tracks. It __________ be a wolf.—It needn't be. It ___________ be a fox.
When you cover the novel, you will have ____better understanding of___ life.
– Did you visit the temple? -- No. We ______ it, but we spent too much time shopping.
I knew that the lady _____ Bill when she spoke of a bright young fellow.
I could have turned to Mr. Smith for help, but he ______ too busy then.
The speaker is giving a rather _______ speech, as I can judge from the _______ look on the listeners.