Duetothebadweathertheplanewas____fortwohours.
A、delayed
B、canceled
C、postponed
D、dismissed
Nancywassurprisedthattheyhave（），Theyseemedtobeahappycouple.
A、splitup
B、brokendown
C、fallenthrough
D、knockedout
TheBentPyramidoutsideCairo__________ancientEgypt’sfirstattempttobuildasmooth-sidedpyramid.
A、hasbeenbelievedtohavebeen
B、wasbelievedtobe
C、isbelievedtohavebeen
D、isbelievedtobe
It’snecessary______ustokeepourpetscleaneveryday.
A、of
B、for
C、with
D、between
Idon’tunderstand____believehim.
A、whydon’tyou
B、whyyouno
C、whyyoudon’t
D、whynotyou