I don’t think David could have done such a stupid thing last night, ____?
| A．did he | B．didn’t he |
| C．do I | D．don’t I |
. It never occurred to humans until the mid-l990s _______some animals can be cloned.
| A．where | B．that | C．when | D．what |
The red flag looks extremely beautiful _______the blue sky and white clouds.
| A．through | B．against | C．across | D．beyond |
The Internet and the effect _______brought about did a lot of good to our daily life and work.
| A．that | B．what | C．which | D．it |
The old couple don’t know what to do with their son, who drinks _______every day.
| A．heavily | B．seriously | C．hardly | D．badly |
--- I’m not good at singing, you know.
--- _______. It’s just for fun.
| A．All right | B．No problem | C．Come on | D．Cheer up |