I find _______ difficult to finish the work on time. We only have three hours left.
| A．it | B．that | C．its | D．this |
—What are you looking for?
—I’m looking for the watch _______ I bought yesterday.
A．which B．who C．whose
—Which season do you like _______, summer or winter?
— Summer.
A．well B．best C．better
—It’s too late. I have to go now.
—Oh, it’s raining outside. Don’t leave _______it stops.
A．since B．until C．while
When Jim’s mother came in, he _______ his homework.
A．is doing B．has done C．was doing