—Hi, Lucy, I’m wondering whether I can use your mobilephone for a while. —I hate to say, but ______.
Russia is _________ on the north of China.
Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.
When the reached the top of the hill ,they _______________ so they had to stop for a rest.
John ____________ his students is playing basketball on the playground.
He does ___________________ that he cannot spare no time to play with his children.