By the year 2020 scientists _____ a lot of research on AIDS

Meimei thinks maths is ______ than Chinese.

rgency meeting will be held tomorrow, at which the bill ________ to pass

Ken, ________, but your TV is going too loud.— Oh, I’m sorry. I’ll turn it down right now.

The trip shouldn’t take more than an hour.— ______It is at least two hours.