I am fond of my sister but she has one serious shortcoming. She _________ be really stubborn.

I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.

As nobody here knows what is wrong with the machine, we          send for an engineer to handle the problem．

You ________ in person; a telephone would have been enough.

It isn’t going to rain, so you        take an umbrella with you.