We should keep our classroom _____.
A. cleans B. cleaning C. clean
It is necessary for us________ good habits in our daily life.
| A．keep | B．to keep | C．keeping | D．kept |
Jeff _______the hospital if he feels better in a few days.
| A．leaves | B．left | C．will leave | D．has left |
---What were you doing at this time last night?
--- I _________ a phone call.
| A．made | B．will make | C．has made | D．was making |
Mr. White _____in that city since he moved there thirty years ago.
| A．lives | B．lived | C．was living | D．has lived |
Don’t make a noise! They _______on a physics problem now.
| A．will work | B．are working | C．worked | D．have worked |