Students are encouraged to _________ the design competition for robots at the university.
It is three years_____ his father smoked . A when B after C since D while
----Won’t you go shopping with your mother ? ----____she promises to buy me a new sweater . A When B If C Unless D Whether
The lecture begins at 9 tomorrow morning .So I have to be at the hall ____8:40 pm. at the latest. A until B after C by D around
______the sales of computers up by 20%every year ,our company is becoming larger .A As B For C With D Through
Which is the longest bridge ______the Changjiang River , do you know ?A through B across C on D over