Every means has been _______. No one is effective.
| A．trying out | B．tried out | C．trying in | D．tried on |
Rather than ______ the plane all the way, they decided _____
__ to Vancouver.
A．taking, flying |
B．take, to flying | C．take, to fly | D．to take, to fly |
He has no money nor friends here. That’s why he ______ sleep in the street.
| A．must | B．has to | C．should | D．may |
It was said ____that was _____ he succeeded in running his business.
| A．that, what | B．that, that | C．what, how | D．that, how |
The farmers are only allowed to cut _____ tr
ees and cut them _____ for firewood once a year.
| A．down, up | B．up, down | C．off, across | D．down, out |
. Doctors say _____ good diet is of ______ great benefit to our health.
| A．a , a | B．the, a | C．a, / | D．the, / |