Zhangqiang is said ______ the experiment in the lab, but I can’t find him there.

It was the first time Mary _____ such a big opening ceremony.

—Haven’t seen Lucy recently. What’s happened?
—Oh, it’s more than two months ______ she worked here.

Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months.

It was the first time that I __________ the night face to face.

--This is the first time I ____ pictures with my own camera.
--It’s time that you ___ a picture of me.

He had hardly reached home _______ an unexpected guest came to visit him.