The electronic red-packet has been so ______ that AliPay and Tencent Wechat compete against each other openly and secretly since the beginning of this year.
By the time he was twelve he ______ a chemistry lab of his own.
David jumped _____ to get the first ______ the beginning of the sports.
Who is the singer ______ you like best?
Whose turn ___ the cleaning?
He ____ to lend me his bike but I refused, for I didn’t want to trouble him.