Our teacher is always busy preparing lessons until 11 o’clock at night, _______we students have gone to sleep.
Parents should encourage their children to __________ in all kinds of activities to train their ability of teamwork.
At last9 nothing but some trees remains,with some branches __________ the wall.
“I __________ to meet you at the office,but I didn't see you,” the student said to the teacher.
__________,his suggestion is not helpful, though it sounds very interesting.
Who did you __________ to pick up the foreigner at the airport?