David felt very happy.________, it was his first time to have a trip to China.
I _______ a museum with my friends at this time yesterday.
—Kangkang, can I borrow your bike? —_______
—Would you like to go for a picnic with us? —_______, but I’m too busy.
If it _______ sunny tomorrow, I ______ the Great Wall.
There is going to _______ a party in our school.