Battery-operated slippers are used________seeing in the dark．
| A．to |
| B．as |
| C．by |
| D．for |
The students told us _____________last summer vacation.
| A．where did they camp | B．where will they camp |
| C．where they camped | D．where they will camp |
Trees ______every spring in North China.
| A．have planted | B．will plant | C．were planted | D．are planted |
—Would you like ______for a walk with me after school?
—Sure, I’d love to.
| A．go | B．gone | C．going | D．to go |
I _______ my homework when the lights in my room went out last night.
| A．did | B．was doing | C．will do | D．have done |
—Is there any ink in the bottle, Linda?
—No, we ________out of it already.
| A．have run | B．will run | C．ran | D．are running |