Experience of this kind in both the U.S. and Europe well before the Second World War.
| A．have conducted | B．have been conducted |
| C．had conducted | D．had been conducted |
---Now, children begin to learn English at a very early age. It is really a good thing?
---_________.
| A．Yes, just in case | B．Well, it depends |
| C．Don’t mention it | D．Believe it or not |
_______ caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ___we should deal with properly.
| A．as | B．that | C．which | D．where |
---The “No.1 Document” is designed to help the rural population increase their incomes.
---I believe that peasants’ life _____ better and better.
| A．will have got | B．has got | C．gets | D．will be getting |
It was not until the end of last year _____ the economy in our country began to develop rapidly.
| A．when | B．that | C．which | D．in which |