The seals _________ living fish.
| A．feed on | B．fed on |
| C．feed by | D．fed by |
---Where is mother?
---She is in the kitchen. She ___ the dinner for the party the whole afternoon.
| A．is preparing | B．was preparing | C．has preparing | D．has been preparing |
The students _______ busily when Miss Brown went to get a book she _______ in the office.
| A．had written; left | B．were writing; has left |
| C．had written; had left | D．were writing; had left |
The building which _____ now will be our science laboratory.
| A．is being built | B．will be built | C．is built | D．has been built |
---What bad weather! It’s raining all these days.
---Yes, the river has _____ two feet.
| A．risen | B．lifted | C．grown | D．raised |
The harder you_______ , the greater progress you______ .
| A．will study; will make | B．will study; make | C．study; make | D．study; will make |