—Amy, I called you yesterday evening，but nobody answered the phone.
—Oh, I ________ a walk with my mother at that time.
| A．take | B．took |
| C．am taking | D．was taking |
I have been ______ English _______ ten years.
A. study; for B. studying; since C. studying ; for
He _____ when the UFO arrived.
A. was sleeping B. were sleeping C. has slept
Why not _____ boating with us in the park?
A. to goB. goingC. go
I hope we will have _______ people and _______ pollution.
A. fewer, less B. fewer, fewer C. less, less
I don’t know if he________ to the park tomorrow. If he ________, I won’t go, either.
A. goes, goes B. will go, doesn’t go C. will go, won’t go