r to stop poverty, the World Bank has ______ its focus to providingtechnical assistance and long-term loans to developing countries.

He was inspired to start again _________ hehad failed.

Storms most commonly occur_______a warm airmass and a cold air mass touch each other.

Our Chinese teacher can speak some English. That’s because he ________some foreigners Chinese in an international company.

My father had _______ sleep last night ,so he felt _______ sleepy today.