QQ，________ you can chat with your friends, makes communication easy.
| A．as | B．which | C．that | D．where |
Is this the reason _______ to you for his carelessness in the exams?
| A．how he explained | B．why he explained |
| C．what he explained | D．he explained |
---Your job _______ open for your return.
--- Thanks.
| A．will keep | B．will be kept | C．had kept | D．had been kept |
Who will _______ the company if our manager isn’t here next week?
| A．in charge of | B．in the charge of | C．take charge of | D．take the charge of |
Jack has three sons, and both of _______ are studying in China.
| A．them | B．that | C．whom | D．who |
--- What is the price of petrol these days?
--- Oh, it _______ sharply since last month.
| A．is raised | B．has risen | C．has raised | D．is increased |