26．______life began on the earth is one of the biggest puzzles to scientists.
| A．How | B．What | C．Where | D．That |
Whenhewasold,MrSmith_____sitforhourswithoutsayinganything.
| A．would | B．should | C．must | D．will |
Iwanttogotothehospital,butyou_____withme.
| A．needtonottogo | B．donotneedgo | C．neednotgo | D．needgonot |
Thelittlekid_____nottouchthedog.
| A．need | B．dare | C．ought | D．could |
Heismuchricherthanwhathe_____.
| A．wouldbe | B．mustbe | C．usedtobe | D．couldbe |
He_____away.Wedon’tseehimanywherearound.
| A．maygo | B．mustgo | C．cango | D．musthavegone |