We don’t doubt ____ he’ll give us muchhelp. _____ we doubt is _____ he’ll come on time

nager was worried about the press conference his assistant _____in his place but ,luckily ,everything was going on smoothly.

The policeman asked me ______ and ______ .

Modern science has given clear evidence ________ smoking can lead to many diseases.(2011·天津，13)

Trains stop here in order to _____passengers only.