The maths problem was so difficult that none of us could ____.
| A．try it out | B．work it out | C．look it up | D．work on it |
__________ good grades, you should try to study harder.
| A．Get | B．In order to get | C．Getting | D．Got |
The big bag is too heavy for the little boy ________. Who volunteers to help him?
| A．carries | B．carrying | C．carried | D．to carry |
Bob used toin the countryside .but mow he is used to in the big city
| A．live ;live | B．live; living | C．living ; living | D．living; live |
Mary will make a plan as soon as she her homework.
| A．finishes | B．finish | C．will finish | D．finished |
If you don’t put up the sings after school, .
| A．so does Jim | B．so will Jim |
| C．neither does Jim | D．neither will Jim |