I think Liu Mei sings best in our class. No one else sings .

Science and technology are developing ______ quickly that some new electronic products are out-of-date within several months

-We had a good time in dancing at a disco, why didn’t you go with us?——-I ________ there, but my parents didn’t let me go

―Kate doesn’t look very wellWhat’s wrong with her? ―She has a headache because she ________ too long; She ought to stop work

Sorry I’m late. I got stuck in traffic. — _________. You’re here now. Come in and sit down.