With time changing so fast, to keep _____ with time, anyone should be a lifelong learner, or he will fall behind within years.
The news was a terrible blow to her, but she ______the shock soon.
.When he goes out, he often wears sunglasses _______nobody can recognize him.
The desks in our classroom are so close together that there is not enough room to move them.
_______ travelling expenses rising a lot, we had to change all our plans for the tour.
Professor Wang ________in our school till next Sunday.