No matter how bright a talker you are, there are times when it is better ______ silent.
| A．remain | B．be remaining |
| C．to remain | D．having remained |
Emergency line operators must always _______calm and make sure that they get all the information they need to send help.
| A．grow | B．appear | C．become | D．stay |
---Do you have any idea what Hawk does all day?
--- I know he spends at least as much time watching TV as he _______.
| A．does writing | B．writes | C．is writing | D．spends on writing |
--- Why are you so angry?
--- Jack failed to return my tennis bat on time again. He _______his words.
| A．is always eating | B．has always eaten |
| C．always eat | D．always ate |
All the doctors in the hospital insisted that he ______ badly wounded and that he ____ at once.
| A．should be; be operated on | B．was; must be operated on |
| C．was; should be operated | D．was; be operated on |
The father along with his children ______ solving word puzzles.
| A．are like | B．is like | C．like | D．likes |