All of the Plants now raised on farms have been developed from plants __ wild.
| A．once they grow | B．they grew once | C．that once grew | D．once grew |
QQ，________ you can chat with your friends, makes communication easy.
| A．as | B．which | C．that | D．where |
—Li Ming is said ________ abroad.Do you know what country he will study in?
—Yes, in London.
| A．to have studied | B．to study |
| C．to be studying | D．to have been studying |
She is very dear to us.We have been prepared to do ________ it takes to save her life.
| A．whichever | B．however |
| C．whatever | D．whoever |
Today, we will begin ________ we stopped yesterday so that no point will be left out.
| A．when | B．where | C．how | D．what |
________， please try your best to solve the problem in time.
| A．Ought you get into trouble |
| B．Must you get into trouble |
| C．Can you get into trouble |
| D．Should you get into trouble |