________ you Alan—Yes, I ________.

The solar-powered airplane Solar Impulse 2 arrived in Nanjing ______ April, 2015.

The child isn’t old enough to _____ himself.

Meeting again by chance, Lucy and Amy are delighted tothe friendship where it left out years ago.

I’m sorry you’ve been waiting so long，but it’ll still be some time ________ Brian gets back.