---Is this experiment easy? ---________,I’11 just do my best.
The teacher asked me _____.
—Oh, it’s you. I didn’t ______ you just now!—That’s because I have just had my hair cut and I’m wearing new glasses.
The number of people at present ______ sixty, but a number of people______ coming here to get tickets for free.
—Why did he come back? —It is ______ he forgot to take his umbrella with him.
— Bob didn’t pass this exam.— He____________.