For sentences 16-20, choose the correct answer(A, B, C, or D)
16. It is essential that we ... this deadline if we want the project to be successful. A) arrive b) meet c) reach d) win
17 could we ... a time for us to meet early next week? A) do b) fix c) put d) hold
18. Under the new system, junior and senior members of staff will work ... together as a team a)nearly b) tightly c) closely d) firmly
19. If we are not ready to take .... this challenge, we will be in serious trouble next year a) on) down c) off d) out
20. It is very important the we .... up with all the latest technology a) stay b) keep c) hold d)take