在空格处填上正确的词使句子结构正确。 1. The news ( ) father would be back next week cheeered us up. 2. Tom made a suggestion ( ) we should not stay up late every night. 3. Our decision ( )we shall have a party this weekend has been canceled. 4.He will never forget that day ( ) he delivered a speech. 5. The Minister formulated a basis ( ) the talks could start. 6. The scientist produced a working model ( ) reliable tests could be conducted.