these poisonous products ________ can cause the symptoms of the flu, such as headache and aching muscles

My English teacher visited Australialast summer.—Which city did he visit—

One’s life has value ________ one brings value to the life of others.(2012·江苏，30)

Will you go to the park tomorrow— If you don’t, ________.

We’d better hurry or we’ll be late—_____ Do you really want to listen tothe boring lecture