The doctor did what he could ________ the dying man.
| A．save | B．to save | C．saved | D．saving |
To solve the traffic problem, more and more bridges ____________ across the river every year.
| A．were built | B．will build | C．are built | D．are building |
Be quick! Jim _______________ for us downstairs.
| A．waits | B．is waiting | C．will wait | D．waited |
—How long have you __________ this book?
—About thirteen days.
| A．brought | B．bought | C．had | D．borrowed |
—_________is it from your school to your house?
—Only a few minutes’ ride.
| A．How long | B．How soon | C．How often | D．How far |
The _____________ we do our homework, the __________ mistakes we will make
| A．more careful, less | B．more carefully, less |
| C．more carefully, fewer | D．more careful, fewer |