—How long do you think it is ________ he arrived here? —No more than half a year, I believe.
| A．when | B．that | C．before | D．since |
_______ is no trouble that the Dallas Mavericks will defeat the Washington Wizards in the next game.
| A．It | B．As |
| C．That | D．There |
Evidence came up _______ specific speech sounds are recognized by babies as young as 6 months old.
| A．what | B．which |
| C．whose | D．that |
It’s impossible for a bee to tell the other bees _______ the food is by speaking to them,but it can _______ a little dancing.
| A．why; do | B．where; do |
| C．what; make | D．how; make |
_______ asks you to get rid of the bad habits is quite right.
| A．Who | B．Those who |
| C．Anyone whom | D．Whoever |
When I try to find _______ that prevents so many people from taking part in the program,it seems to me that there are two main causes.
| A．why it does | B．what it does |
| C．what it is | D．why it is |