______ he did was quite right.
| A．What | B．Which | C． That | D．Who |
According to a new study by a university in Britain, learning a second language can ____ an increase in your brain power.
| A．arise from | B．lie in | C．correspond to | D．lead to |
---Bob has gone to California.
---Oh, can you tell me when he ____?
| A．left | B．has left | C．is leaving | D．would leave |
__Barbara Jones offers to her fans is honesty and happiness.
| A．Which | B．That | C．What | D．whom |
Experiments of this kind ___in both the U.S and Europe well before the Second World War.
| A．had conducted | B．have conducted | C．have been conducted | D．had been conducted |
At the meeting, the old man ______ some good advice about bringing down the market price of housing.
| A．came about | B．came along | C．came up with | D．came out |