I can't say which wine is better—it's a(n)________of personal taste.
| A．matter | B．affair | C．event | D．variety |
As expected，the program is actually slowing down due to a________budget.
| A．flexible | B．complex |
| C．adequate | D．tight |
－Jeffery seems to go without proper food and sleep for days.
－Leave him alone.That's________he reacts to a lost love.
| A．what | B．how |
| C．why | D．when |
She________the opportunity，but unfortunately she just let it go.
| A．should have taken | B．must have taken |
| C．needn't have taken | D．can't have taken |
I don't remember who came first，but we all________the lecture.
| A．attend | B．attended |
| C．have attended | D．are attending |
We can't avoid negative thoughts，but we should make it a habit to replace each negative thought with a positive________．
| A．one | B．ones |
| C．the one | D．that |