He has called several times this morning; _____ there is something very important

__________—Yes. I want some apples.

You can get to Hong Kong using different kinds of ________, by air, by sea or by land.

It has been proved_______eating vegetables in childhood helps to protect you against seriousillnesses in later life.[ ]

At the evening party the host said _____ was able to solve the riddle could get a nice present as a reward.