Lookatthisgroupofpeople______beachvolleyball.
A、played
B、isplayed
C、playing
D、isplaying
A、复温
B、合理喂养
C、预防感染
D、密切观察病情
Hecomplainedtothebooksellerthattherewereseveralpages______inthebook.
A、losing
B、missing
C、dropping
D、lacking
Mywalletisnowheretobefound.I_____itwhenIwasonthebus.
A、mustdrop
B、shouldhavedropped
C、haddropped
D、musthavedropped