—Ready to give up guessing, Sandy?—No, no. Hold on! I think I _______ at the answer now.
I had just got up and was about to cook my breakfast__________ the telephone rang, but it was hung up __________ I could answer it.
Swimmers must be very strong in order to build up speed because of the high resistance (阻力)of the water. Runners,__________, must struggle against the heavy resistance of the air and ground.
They're not playing baseball today __________ the rain.
In some places women are expected to earn money __________ men work at home and raise their children.
Joe, don't __________ now ; you're improving all the time. It won't be long __________ you can speak English well.