One way to understand thousands of new words is to gain ________ good knowledge of basic word formation.
| A．/ | B．the | C．a | D．one |
“You _______ be so tired that you had to stop to rest．”
| A．should | B．can’t | C．must | D．mustn’t |
He must have finished the work yesterday, _______ he ?
| A．mustn’t | B．haven’t | C．didn’t | D．hasn’t |
He must have lived here for 10 years, _______ he?
| A．mustn’t | B．haven’t | C．didn’t | D．hasn’t |
“Where is it?” “Where is _____? I don't know what do you mean?”
| A．what | B． that | C．where | D．so |
He was in great need of money, so he _____ $5, 000 for his car.
| A．paid | B．took | C．cost | D．spent |