Susan’s parents have bought a large house with a swimming-pool. It ____ be very expensive.
| A．must | B．can | C．mustn’t | D．can’t |
—Dad,mustIpractise thepianotoday?
—No,you _.You may doit tomorrow.
| A．needn’t | B．mustn’t | C．shouldn’t | D．can’t |
Youwillfallbehind others youwork hard.
| A．if | B．unless | C．though | D．since |
—Jack, youseemto be .
—Yes.It’s 8:20 now and my trainleaves in tenminutes.
| A．in ahurry | B．in fear | C．in safety | D．in silence |
We find impossible forus tolearna foreignlanguage wellina shorttime.
| A．that | B．this | C．one | D．it |
—willyoufinishdoingthework?
—In a fewweeks.
| A．Howlong | B．How far | C．How soon | D．How often |