The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
| A．what | B．who | C．that | D．which |
Although technically speaking you may not have __________, you certainly haven't told us the whole truth.
| A．laid | B．lay | C．lied | D．lain |
My aunt always brings me a pretty gift __________ she comes.
| A．by the time | B．at other times |
| C．every time | D．at times |
If you turn your bag __________, the books will fall out.
| A．back to front | B．up and down |
| C．upside down | D．back and forth |
They failed several times, and they finally __________ the hope of finding an effective way of solving the problem.
| A．abandoned | B．released | C．discouraged | D．resigned |
Eliza remembers everything exactly as if it __________ yesterday.
| A．was happening | B．happens |
| C．has happened | D．happened |