—The project wasn’t’ difficult for him, was it ?— . He should have been given a more difficult one .
The doctor will not permit mother up __________ her leg is better.
Either his wife or his friends __________ his birthday party.
No one knows __________ it will be fine tomorrow and __________ we can play basketball together.
Loulan is believed __________ over by sandstorms gradually from AD200 to AD400.
They were having an argument about __________ turn it was to do the cooking.